init

.github/workflows/docker.yml

@@ -0,0 +1,44 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Cache Docker layers
+      uses: actions/cache@v2
+      with:
+        path: /tmp/.buildx-cache
+        key: ${{ runner.os }}-buildx-${{ github.sha }}
+        restore-keys: |
+          ${{ runner.os }}-buildx-
+
+    - name: Log in to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v2
+      with:
+        context: ./server
+        push: true
+        tags: juli0n21/thumbnails:latest 
+
+    - name: Logout from Docker Hub
+      run: docker logout

.gitignore

@@ -0,0 +1,2 @@
+client/testdata
+client/thumbnail

MAKEFILE

@@ -0,0 +1,9 @@
+# Makefile
+
+# Define the 'proto' target
+proto:
+	# Generate Go code for the client
+	protoc --go_out=./client --go-grpc_out=./client ./thumbnail.proto
+	
+	# Generate Go code for the server
+	protoc --go_out=./server --go-grpc_out=./server ./thumbnail.proto

README.md

@@ -0,0 +1,11 @@
+### Small docker containe to generate preview images for diffrent filetypes
+
+# Usage:
+- generate client code from the `thumbnail.proto` file, make the request with the files ... profit?
+
+> [!WARNING]
+> their are no plans to maintain or extend this
+
+#### Dependencys
+
+check the [Dockerfile](./server/Dockerfile) and [go.mod](./server/go.mod)

client/go.mod

@@ -0,0 +1,15 @@
+module thumbnailclient
+
+go 1.24.1
+
+require (
+	google.golang.org/grpc v1.71.0
+	google.golang.org/protobuf v1.36.6
+)
+
+require (
+	golang.org/x/net v0.34.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f // indirect
+)

client/go.sum

@@ -0,0 +1,34 @@
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/otel v1.34.0 h1:zRLXxLCgL1WyKsPVrgbSdMN4c0FMkDAskSTQP+0hdUY=
+go.opentelemetry.io/otel v1.34.0/go.mod h1:OWFPOQ+h4G8xpyjgqo4SxJYdDQ/qmRH+wivy7zzx9oI=
+go.opentelemetry.io/otel/metric v1.34.0 h1:+eTR3U0MyfWjRDhmFMxe2SsW64QrZ84AOhvqS7Y+PoQ=
+go.opentelemetry.io/otel/metric v1.34.0/go.mod h1:CEDrp0fy2D0MvkXE+dPV7cMi8tWZwX3dmaIhwPOaqHE=
+go.opentelemetry.io/otel/sdk v1.34.0 h1:95zS4k/2GOy069d321O8jWgYsW3MzVV+KuSPKp7Wr1A=
+go.opentelemetry.io/otel/sdk v1.34.0/go.mod h1:0e/pNiaMAqaykJGKbi+tSjWfNNHMTxoC9qANsCzbyxU=
+go.opentelemetry.io/otel/sdk/metric v1.34.0 h1:5CeK9ujjbFVL5c1PhLuStg1wxA7vQv7ce1EK0Gyvahk=
+go.opentelemetry.io/otel/sdk/metric v1.34.0/go.mod h1:jQ/r8Ze28zRKoNRdkjCZxfs6YvBTG1+YIqyFVFYec5w=
+go.opentelemetry.io/otel/trace v1.34.0 h1:+ouXS2V8Rd4hp4580a8q23bg0azF2nI8cqLYnC8mh/k=
+go.opentelemetry.io/otel/trace v1.34.0/go.mod h1:Svm7lSjQD7kG7KJ/MUHPVXSDGz2OX4h0M2jHBhmSfRE=
+golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
+golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f h1:OxYkA3wjPsZyBylwymxSHa7ViiW1Sml4ToBrncvFehI=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f/go.mod h1:+2Yz8+CLJbIfL9z73EW45avw8Lmge3xVElCP9zEKi50=
+google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
+google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=

client/main.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+
+	pb "thumbnailclient/proto"
+
+	"google.golang.org/grpc"
+)
+
+func main() {
+	conn, err := grpc.NewClient("localhost:50051", grpc.WithInsecure(), grpc.WithBlock())
+	if err != nil {
+		log.Fatalf("Failed to connect to server: %v", err)
+	}
+	defer conn.Close()
+
+	type thingy struct {
+		Type pb.FileType
+		Path string
+	}
+	client := pb.NewThumbnailServiceClient(conn)
+	filePath := []thingy{
+		{pb.FileType_IMAGE, "testdata/image-sample.png"},
+		{pb.FileType_PDF, "testdata/pdf-sample.pdf"},
+		{pb.FileType_VIDEO, "testdata/video-sample.webm"}}
+
+	for _, f := range filePath {
+		newFunction(f.Path, f.Type, client)
+	}
+
+}
+
+func newFunction(filePath string, ftype pb.FileType, client pb.ThumbnailServiceClient) {
+	fileContent, err := os.ReadFile(filePath)
+	if err != nil {
+		log.Fatalf("Error reading file: %v", err)
+	}
+
+	req := &pb.ThumbnailRequest{
+		FileContent: fileContent,
+		FileType:    ftype,
+		MaxHeight:   150,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	resp, err := client.GenerateThumbnail(ctx, req)
+	if err != nil {
+		log.Fatalf("Error calling GenerateThumbnail: %v", err)
+	}
+
+	fmt.Printf("Response: %s\n", resp.Message)
+	if len(resp.ThumbnailContent) > 0 {
+		err := saveThumbnailToFile(resp.ThumbnailContent, filePath)
+		if err != nil {
+			log.Fatalf("Error saving thumbnail to file: %v", err)
+		}
+		fmt.Println("Thumbnail saved successfully.")
+	} else {
+		log.Println("No thumbnail content received.")
+	}
+}
+
+// Function to save the thumbnail content to a file in the 'thumbnail/' directory
+func saveThumbnailToFile(thumbnailContent []byte, filePath string) error {
+	// Ensure the "thumbnail" directory exists
+	err := os.MkdirAll("thumbnail", os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
+
+	// Create the file where the thumbnail will be saved
+	baseName := filepath.Base(filePath)
+	fileName := strings.TrimSuffix(baseName, filepath.Ext(baseName))
+
+	err = os.WriteFile(path.Join("thumbnail", fileName)+".jpg", thumbnailContent, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to save thumbnail to file: %v", err)
+	}
+
+	return nil
+}

client/proto/thumbnail.pb.go

@@ -0,0 +1,274 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.6
+// 	protoc        v3.21.12
+// source: thumbnail.proto
+
+package proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Enum for the file type
+type FileType int32
+
+const (
+	FileType_FILE_TYPE_UNSPECIFIED FileType = 0 // Default value for unspecified file type
+	FileType_IMAGE                 FileType = 1 // Image file
+	FileType_VIDEO                 FileType = 2 // Video file
+	FileType_PDF                   FileType = 3 // PDF file
+)
+
+// Enum value maps for FileType.
+var (
+	FileType_name = map[int32]string{
+		0: "FILE_TYPE_UNSPECIFIED",
+		1: "IMAGE",
+		2: "VIDEO",
+		3: "PDF",
+	}
+	FileType_value = map[string]int32{
+		"FILE_TYPE_UNSPECIFIED": 0,
+		"IMAGE":                 1,
+		"VIDEO":                 2,
+		"PDF":                   3,
+	}
+)
+
+func (x FileType) Enum() *FileType {
+	p := new(FileType)
+	*p = x
+	return p
+}
+
+func (x FileType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FileType) Descriptor() protoreflect.EnumDescriptor {
+	return file_thumbnail_proto_enumTypes[0].Descriptor()
+}
+
+func (FileType) Type() protoreflect.EnumType {
+	return &file_thumbnail_proto_enumTypes[0]
+}
+
+func (x FileType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use FileType.Descriptor instead.
+func (FileType) EnumDescriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{0}
+}
+
+// Request message for generating thumbnails
+type ThumbnailRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	FileContent   []byte                 `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`                         // File content as bytes
+	FileType      FileType               `protobuf:"varint,2,opt,name=file_type,json=fileType,proto3,enum=thumbnail_service.FileType" json:"file_type,omitempty"` // File type (image, video, pdf)
+	MaxWidth      int32                  `protobuf:"varint,3,opt,name=max_width,json=maxWidth,proto3" json:"max_width,omitempty"`                                 // Optional max width for resizing (0 means no limit)
+	MaxHeight     int32                  `protobuf:"varint,4,opt,name=max_height,json=maxHeight,proto3" json:"max_height,omitempty"`                              // Optional max height for resizing (0 means no limit)
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ThumbnailRequest) Reset() {
+	*x = ThumbnailRequest{}
+	mi := &file_thumbnail_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ThumbnailRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ThumbnailRequest) ProtoMessage() {}
+
+func (x *ThumbnailRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_thumbnail_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ThumbnailRequest.ProtoReflect.Descriptor instead.
+func (*ThumbnailRequest) Descriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ThumbnailRequest) GetFileContent() []byte {
+	if x != nil {
+		return x.FileContent
+	}
+	return nil
+}
+
+func (x *ThumbnailRequest) GetFileType() FileType {
+	if x != nil {
+		return x.FileType
+	}
+	return FileType_FILE_TYPE_UNSPECIFIED
+}
+
+func (x *ThumbnailRequest) GetMaxWidth() int32 {
+	if x != nil {
+		return x.MaxWidth
+	}
+	return 0
+}
+
+func (x *ThumbnailRequest) GetMaxHeight() int32 {
+	if x != nil {
+		return x.MaxHeight
+	}
+	return 0
+}
+
+// Response message for the thumbnail generation
+type ThumbnailResponse struct {
+	state            protoimpl.MessageState `protogen:"open.v1"`
+	Message          string                 `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`                                           // Message indicating success or failure
+	ThumbnailContent []byte                 `protobuf:"bytes,2,opt,name=thumbnail_content,json=thumbnailContent,proto3" json:"thumbnail_content,omitempty"` // Thumbnail content as bytes
+	unknownFields    protoimpl.UnknownFields
+	sizeCache        protoimpl.SizeCache
+}
+
+func (x *ThumbnailResponse) Reset() {
+	*x = ThumbnailResponse{}
+	mi := &file_thumbnail_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ThumbnailResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ThumbnailResponse) ProtoMessage() {}
+
+func (x *ThumbnailResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_thumbnail_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ThumbnailResponse.ProtoReflect.Descriptor instead.
+func (*ThumbnailResponse) Descriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ThumbnailResponse) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
+func (x *ThumbnailResponse) GetThumbnailContent() []byte {
+	if x != nil {
+		return x.ThumbnailContent
+	}
+	return nil
+}
+
+var File_thumbnail_proto protoreflect.FileDescriptor
+
+const file_thumbnail_proto_rawDesc = "" +
+	"\n" +
+	"\x0fthumbnail.proto\x12\x11thumbnail_service\"\xab\x01\n" +
+	"\x10ThumbnailRequest\x12!\n" +
+	"\ffile_content\x18\x01 \x01(\fR\vfileContent\x128\n" +
+	"\tfile_type\x18\x02 \x01(\x0e2\x1b.thumbnail_service.FileTypeR\bfileType\x12\x1b\n" +
+	"\tmax_width\x18\x03 \x01(\x05R\bmaxWidth\x12\x1d\n" +
+	"\n" +
+	"max_height\x18\x04 \x01(\x05R\tmaxHeight\"Z\n" +
+	"\x11ThumbnailResponse\x12\x18\n" +
+	"\amessage\x18\x01 \x01(\tR\amessage\x12+\n" +
+	"\x11thumbnail_content\x18\x02 \x01(\fR\x10thumbnailContent*D\n" +
+	"\bFileType\x12\x19\n" +
+	"\x15FILE_TYPE_UNSPECIFIED\x10\x00\x12\t\n" +
+	"\x05IMAGE\x10\x01\x12\t\n" +
+	"\x05VIDEO\x10\x02\x12\a\n" +
+	"\x03PDF\x10\x032r\n" +
+	"\x10ThumbnailService\x12^\n" +
+	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponseB\tZ\a./protob\x06proto3"
+
+var (
+	file_thumbnail_proto_rawDescOnce sync.Once
+	file_thumbnail_proto_rawDescData []byte
+)
+
+func file_thumbnail_proto_rawDescGZIP() []byte {
+	file_thumbnail_proto_rawDescOnce.Do(func() {
+		file_thumbnail_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_thumbnail_proto_rawDesc), len(file_thumbnail_proto_rawDesc)))
+	})
+	return file_thumbnail_proto_rawDescData
+}
+
+var file_thumbnail_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_thumbnail_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_thumbnail_proto_goTypes = []any{
+	(FileType)(0),             // 0: thumbnail_service.FileType
+	(*ThumbnailRequest)(nil),  // 1: thumbnail_service.ThumbnailRequest
+	(*ThumbnailResponse)(nil), // 2: thumbnail_service.ThumbnailResponse
+}
+var file_thumbnail_proto_depIdxs = []int32{
+	0, // 0: thumbnail_service.ThumbnailRequest.file_type:type_name -> thumbnail_service.FileType
+	1, // 1: thumbnail_service.ThumbnailService.GenerateThumbnail:input_type -> thumbnail_service.ThumbnailRequest
+	2, // 2: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
+	2, // [2:3] is the sub-list for method output_type
+	1, // [1:2] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_thumbnail_proto_init() }
+func file_thumbnail_proto_init() {
+	if File_thumbnail_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_thumbnail_proto_rawDesc), len(file_thumbnail_proto_rawDesc)),
+			NumEnums:      1,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_thumbnail_proto_goTypes,
+		DependencyIndexes: file_thumbnail_proto_depIdxs,
+		EnumInfos:         file_thumbnail_proto_enumTypes,
+		MessageInfos:      file_thumbnail_proto_msgTypes,
+	}.Build()
+	File_thumbnail_proto = out.File
+	file_thumbnail_proto_goTypes = nil
+	file_thumbnail_proto_depIdxs = nil
+}

client/proto/thumbnail_grpc.pb.go

@@ -0,0 +1,125 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v3.21.12
+// source: thumbnail.proto
+
+package proto
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	ThumbnailService_GenerateThumbnail_FullMethodName = "/thumbnail_service.ThumbnailService/GenerateThumbnail"
+)
+
+// ThumbnailServiceClient is the client API for ThumbnailService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+//
+// Service definition
+type ThumbnailServiceClient interface {
+	GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error)
+}
+
+type thumbnailServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewThumbnailServiceClient(cc grpc.ClientConnInterface) ThumbnailServiceClient {
+	return &thumbnailServiceClient{cc}
+}
+
+func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ThumbnailResponse)
+	err := c.cc.Invoke(ctx, ThumbnailService_GenerateThumbnail_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ThumbnailServiceServer is the server API for ThumbnailService service.
+// All implementations must embed UnimplementedThumbnailServiceServer
+// for forward compatibility.
+//
+// Service definition
+type ThumbnailServiceServer interface {
+	GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error)
+	mustEmbedUnimplementedThumbnailServiceServer()
+}
+
+// UnimplementedThumbnailServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedThumbnailServiceServer struct{}
+
+func (UnimplementedThumbnailServiceServer) GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GenerateThumbnail not implemented")
+}
+func (UnimplementedThumbnailServiceServer) mustEmbedUnimplementedThumbnailServiceServer() {}
+func (UnimplementedThumbnailServiceServer) testEmbeddedByValue()                          {}
+
+// UnsafeThumbnailServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ThumbnailServiceServer will
+// result in compilation errors.
+type UnsafeThumbnailServiceServer interface {
+	mustEmbedUnimplementedThumbnailServiceServer()
+}
+
+func RegisterThumbnailServiceServer(s grpc.ServiceRegistrar, srv ThumbnailServiceServer) {
+	// If the following call pancis, it indicates UnimplementedThumbnailServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&ThumbnailService_ServiceDesc, srv)
+}
+
+func _ThumbnailService_GenerateThumbnail_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ThumbnailRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ThumbnailServiceServer).GenerateThumbnail(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ThumbnailService_GenerateThumbnail_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ThumbnailServiceServer).GenerateThumbnail(ctx, req.(*ThumbnailRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ThumbnailService_ServiceDesc is the grpc.ServiceDesc for ThumbnailService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ThumbnailService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "thumbnail_service.ThumbnailService",
+	HandlerType: (*ThumbnailServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GenerateThumbnail",
+			Handler:    _ThumbnailService_GenerateThumbnail_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "thumbnail.proto",
+}

server/Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:1.24.1
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y \
+    imagemagick \
+    ffmpeg \
+    poppler-utils && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY . .
+
+EXPOSE 50051
+
+RUN go mod tidy && go build -o thumbnail-service
+
+CMD ["./thumbnail-service"]

server/go.mod

@@ -0,0 +1,16 @@
+module github.com/JuLi0n21/thumbnail_service
+
+go 1.24.1
+
+require (
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
+	google.golang.org/grpc v1.71.0
+	google.golang.org/protobuf v1.36.6
+)
+
+require (
+	golang.org/x/net v0.37.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/text v0.23.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4 // indirect
+)

server/go.sum

@@ -0,0 +1,46 @@
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
+go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
+go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
+go.opentelemetry.io/otel v1.34.0 h1:zRLXxLCgL1WyKsPVrgbSdMN4c0FMkDAskSTQP+0hdUY=
+go.opentelemetry.io/otel v1.34.0/go.mod h1:OWFPOQ+h4G8xpyjgqo4SxJYdDQ/qmRH+wivy7zzx9oI=
+go.opentelemetry.io/otel/metric v1.34.0 h1:+eTR3U0MyfWjRDhmFMxe2SsW64QrZ84AOhvqS7Y+PoQ=
+go.opentelemetry.io/otel/metric v1.34.0/go.mod h1:CEDrp0fy2D0MvkXE+dPV7cMi8tWZwX3dmaIhwPOaqHE=
+go.opentelemetry.io/otel/sdk v1.34.0 h1:95zS4k/2GOy069d321O8jWgYsW3MzVV+KuSPKp7Wr1A=
+go.opentelemetry.io/otel/sdk v1.34.0/go.mod h1:0e/pNiaMAqaykJGKbi+tSjWfNNHMTxoC9qANsCzbyxU=
+go.opentelemetry.io/otel/sdk/metric v1.34.0 h1:5CeK9ujjbFVL5c1PhLuStg1wxA7vQv7ce1EK0Gyvahk=
+go.opentelemetry.io/otel/sdk/metric v1.34.0/go.mod h1:jQ/r8Ze28zRKoNRdkjCZxfs6YvBTG1+YIqyFVFYec5w=
+go.opentelemetry.io/otel/trace v1.34.0 h1:+ouXS2V8Rd4hp4580a8q23bg0azF2nI8cqLYnC8mh/k=
+go.opentelemetry.io/otel/trace v1.34.0/go.mod h1:Svm7lSjQD7kG7KJ/MUHPVXSDGz2OX4h0M2jHBhmSfRE=
+golang.org/x/net v0.34.0 h1:Mb7Mrk043xzHgnRM88suvJFwzVrRfHEHJEl5/71CKw0=
+golang.org/x/net v0.34.0/go.mod h1:di0qlW3YNM5oh6GqDGQr92MyTozJPmybPK4Ev/Gm31k=
+golang.org/x/net v0.37.0 h1:1zLorHbz+LYj7MQlSf1+2tPIIgibq2eL5xkrGk6f+2c=
+golang.org/x/net v0.37.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
+golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
+golang.org/x/text v0.23.0 h1:D71I7dUrlY+VX0gQShAThNGHFxZ13dGLBHQLVl1mJlY=
+golang.org/x/text v0.23.0/go.mod h1:/BLNzu4aZCJ1+kcD0DNRotWKage4q2rGVAg4o22unh4=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f h1:OxYkA3wjPsZyBylwymxSHa7ViiW1Sml4ToBrncvFehI=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250115164207-1a7da9e5054f/go.mod h1:+2Yz8+CLJbIfL9z73EW45avw8Lmge3xVElCP9zEKi50=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4 h1:iK2jbkWL86DXjEx0qiHcRE9dE4/Ahua5k6V8OWFb//c=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20250313205543-e70fdf4c4cb4/go.mod h1:LuRYeWDFV6WOn90g357N17oMCaxpgCnbi/44qJvDn2I=
+google.golang.org/grpc v1.71.0 h1:kF77BGdPTQ4/JZWMlb9VpJ5pa25aqvVqogsxNHHdeBg=
+google.golang.org/grpc v1.71.0/go.mod h1:H0GRtasmQOh9LkFoCPDu3ZrwUtD1YGE+b2vYBYd/8Ec=
+google.golang.org/protobuf v1.36.4 h1:6A3ZDJHn/eNqc1i+IdefRzy/9PokBTPvcqMySR7NNIM=
+google.golang.org/protobuf v1.36.4/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
+google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=

server/main.go

@@ -0,0 +1,210 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"image"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"strings"
+
+	_ "image/gif"
+	"image/jpeg"
+	_ "image/jpeg"
+	"image/png"
+	_ "image/png"
+
+	pb "github.com/JuLi0n21/thumbnail_service/proto"
+	"github.com/nfnt/resize"
+	"google.golang.org/grpc"
+)
+
+// Helper function to generate video thumbnails using ffmpeg
+func generateVideoThumbnail(inputPath, outputPath string, maxWidth, maxHeight int) error {
+	cmd := exec.Command("ffmpeg", "-i", inputPath, "-vf", "thumbnail", "-frames:v", "1", outputPath)
+	var stderr strings.Builder
+	cmd.Stderr = &stderr
+
+	err := cmd.Run()
+
+	if err != nil {
+		return fmt.Errorf("failed to generate video thumbnail using FFmpeg: %v. FFmpeg stderr: %s", err, stderr.String())
+	}
+
+	if maxWidth > 0 || maxHeight > 0 {
+		return resizeImage(outputPath, outputPath, maxWidth, maxHeight)
+	}
+	return nil
+}
+
+// Helper function to generate PDF thumbnails using poppler-utils (pdftoppm)
+func generatePdfThumbnail(inputPath, outputPath string, maxWidth, maxHeight int) error {
+	// Command for Poppler-utils to generate a thumbnail from the first page of a PDF file
+	cmd := exec.Command("pdftoppm", inputPath, outputPath, "-jpeg", "-f", "1", "-l", "1", "-scale-to", "200")
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("failed to generate PDF thumbnail using Poppler-utils: %v", err)
+	}
+
+	outputFileWithPage := fmt.Sprintf("%s-01.jpg", outputPath) // pdftoppm output file with page number suffix
+
+	// Rename the file
+	err = os.Rename(outputFileWithPage, outputPath)
+	if err != nil {
+		return fmt.Errorf("failed to rename file: %v", err)
+	}
+
+	// Resize the generated image if maxWidth or maxHeight is provided
+	if maxWidth > 0 || maxHeight > 0 {
+		return resizeImage(outputPath, outputPath, maxWidth, maxHeight)
+	}
+
+	return nil
+}
+
+func resizeImage(inputPath, outputPath string, maxWidth, maxHeight int) error {
+	// Open the input image file
+	file, err := os.Open(inputPath)
+	if err != nil {
+		return fmt.Errorf("failed to open image file: %v", err)
+	}
+	defer file.Close()
+
+	// Decode the image
+	img, imgType, err := image.Decode(file)
+	if err != nil {
+		return fmt.Errorf("failed to decode image: %v", err)
+	}
+
+	// Calculate the new dimensions, preserving the aspect ratio
+	var newWidth, newHeight int
+	if maxWidth > 0 && maxHeight > 0 {
+		// Resize with both width and height limit
+		newWidth = maxWidth
+		newHeight = maxHeight
+	} else if maxWidth > 0 {
+		// Resize based on width
+		newWidth = maxWidth
+		newHeight = int(float64(img.Bounds().Dy()) * float64(maxWidth) / float64(img.Bounds().Dx()))
+	} else if maxHeight > 0 {
+		// Resize based on height
+		newHeight = maxHeight
+		newWidth = int(float64(img.Bounds().Dx()) * float64(maxHeight) / float64(img.Bounds().Dy()))
+	} else {
+		// No resizing needed
+		newWidth = img.Bounds().Dx()
+		newHeight = img.Bounds().Dy()
+	}
+
+	// Resize the image using the calculated dimensions
+	resizedImg := resize.Resize(uint(newWidth), uint(newHeight), img, resize.Lanczos3)
+
+	// Create the output file
+	outFile, err := os.Create(outputPath)
+	if err != nil {
+		return fmt.Errorf("failed to create output file: %v", err)
+	}
+	defer outFile.Close()
+	switch imgType {
+	case "jpeg":
+		err = jpeg.Encode(outFile, resizedImg, nil)
+		if err != nil {
+			return fmt.Errorf("failed to save resized image as jpeg: %v", err)
+		}
+	case "png":
+		err = png.Encode(outFile, resizedImg)
+		if err != nil {
+			return fmt.Errorf("failed to save resized image as png: %v", err)
+		}
+	default:
+		return fmt.Errorf("unsupported image type: %v", imgType)
+	}
+
+	return nil
+}
+
+type server struct {
+	pb.UnimplementedThumbnailServiceServer
+}
+
+func (s *server) GenerateThumbnail(ctx context.Context, req *pb.ThumbnailRequest) (*pb.ThumbnailResponse, error) {
+	// Create a temporary file to store the uploaded content
+	tempFile, err := os.CreateTemp("", "upload-*")
+	if err != nil {
+		return nil, fmt.Errorf("failed to create temporary file: %v", err)
+	}
+	defer os.Remove(tempFile.Name()) // Cleanup temporary file
+
+	// Write the content from the request to the temporary file
+	err = os.WriteFile(tempFile.Name(), req.FileContent, 0644)
+	if err != nil {
+		return nil, fmt.Errorf("failed to write content to file: %v", err)
+	}
+
+	// Generate thumbnail and save it to disk based on file type
+	var outputPath string
+
+	// Check file type using enum
+	switch req.FileType {
+	case pb.FileType_IMAGE:
+		// Image file, use ImageMagick or other Go logic to create a thumbnail
+		outputPath = "thumbnails/image-thumbnail.jpg"
+		err = resizeImage(tempFile.Name(), outputPath, int(req.MaxWidth), int(req.MaxHeight))
+		if err != nil {
+			return nil, err
+		}
+
+	case pb.FileType_VIDEO:
+		// Video file, use FFmpeg to create a thumbnail
+		outputPath = "thumbnails/video-thumbnail.jpg" // Video thumbnails are typically saved as JPG
+		err = generateVideoThumbnail(tempFile.Name(), outputPath, int(req.MaxWidth), int(req.MaxHeight))
+		if err != nil {
+			return nil, err
+		}
+
+	case pb.FileType_PDF:
+		// PDF file, use Poppler-utils to create a thumbnail
+		outputPath = "thumbnails/pdf-thumbnail.jpg" // PDF thumbnails are typically saved as JPG
+		err = generatePdfThumbnail(tempFile.Name(), outputPath, int(req.MaxWidth), int(req.MaxHeight))
+		if err != nil {
+			return nil, err
+		}
+
+	default:
+		return nil, fmt.Errorf("unsupported file type: %v", req.FileType)
+	}
+
+	// Read the generated thumbnail back into memory to send it as bytes
+	thumbnailContent, err := os.ReadFile(outputPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read generated thumbnail: %v", err)
+	}
+
+	// Return the response with the thumbnail bytes and output path
+	return &pb.ThumbnailResponse{
+		Message:          "Thumbnail generated successfully",
+		ThumbnailContent: thumbnailContent, // Send the thumbnail as bytes
+	}, nil
+}
+
+func main() {
+	// Set up a listener on port 50051
+	listen, err := net.Listen("tcp", ":50051")
+	if err != nil {
+		log.Fatalf("Failed to listen: %v", err)
+	}
+
+	// Create a gRPC server
+	grpcServer := grpc.NewServer()
+
+	// Register the server
+	pb.RegisterThumbnailServiceServer(grpcServer, &server{})
+
+	// Start serving requests
+	log.Println("Server started on port 50051")
+	if err := grpcServer.Serve(listen); err != nil {
+		log.Fatalf("Failed to serve: %v", err)
+	}
+}

server/proto/thumbnail.pb.go

@@ -0,0 +1,274 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.6
+// 	protoc        v3.21.12
+// source: thumbnail.proto
+
+package proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Enum for the file type
+type FileType int32
+
+const (
+	FileType_FILE_TYPE_UNSPECIFIED FileType = 0 // Default value for unspecified file type
+	FileType_IMAGE                 FileType = 1 // Image file
+	FileType_VIDEO                 FileType = 2 // Video file
+	FileType_PDF                   FileType = 3 // PDF file
+)
+
+// Enum value maps for FileType.
+var (
+	FileType_name = map[int32]string{
+		0: "FILE_TYPE_UNSPECIFIED",
+		1: "IMAGE",
+		2: "VIDEO",
+		3: "PDF",
+	}
+	FileType_value = map[string]int32{
+		"FILE_TYPE_UNSPECIFIED": 0,
+		"IMAGE":                 1,
+		"VIDEO":                 2,
+		"PDF":                   3,
+	}
+)
+
+func (x FileType) Enum() *FileType {
+	p := new(FileType)
+	*p = x
+	return p
+}
+
+func (x FileType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (FileType) Descriptor() protoreflect.EnumDescriptor {
+	return file_thumbnail_proto_enumTypes[0].Descriptor()
+}
+
+func (FileType) Type() protoreflect.EnumType {
+	return &file_thumbnail_proto_enumTypes[0]
+}
+
+func (x FileType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use FileType.Descriptor instead.
+func (FileType) EnumDescriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{0}
+}
+
+// Request message for generating thumbnails
+type ThumbnailRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	FileContent   []byte                 `protobuf:"bytes,1,opt,name=file_content,json=fileContent,proto3" json:"file_content,omitempty"`                         // File content as bytes
+	FileType      FileType               `protobuf:"varint,2,opt,name=file_type,json=fileType,proto3,enum=thumbnail_service.FileType" json:"file_type,omitempty"` // File type (image, video, pdf)
+	MaxWidth      int32                  `protobuf:"varint,3,opt,name=max_width,json=maxWidth,proto3" json:"max_width,omitempty"`                                 // Optional max width for resizing (0 means no limit)
+	MaxHeight     int32                  `protobuf:"varint,4,opt,name=max_height,json=maxHeight,proto3" json:"max_height,omitempty"`                              // Optional max height for resizing (0 means no limit)
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ThumbnailRequest) Reset() {
+	*x = ThumbnailRequest{}
+	mi := &file_thumbnail_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ThumbnailRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ThumbnailRequest) ProtoMessage() {}
+
+func (x *ThumbnailRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_thumbnail_proto_msgTypes[0]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ThumbnailRequest.ProtoReflect.Descriptor instead.
+func (*ThumbnailRequest) Descriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *ThumbnailRequest) GetFileContent() []byte {
+	if x != nil {
+		return x.FileContent
+	}
+	return nil
+}
+
+func (x *ThumbnailRequest) GetFileType() FileType {
+	if x != nil {
+		return x.FileType
+	}
+	return FileType_FILE_TYPE_UNSPECIFIED
+}
+
+func (x *ThumbnailRequest) GetMaxWidth() int32 {
+	if x != nil {
+		return x.MaxWidth
+	}
+	return 0
+}
+
+func (x *ThumbnailRequest) GetMaxHeight() int32 {
+	if x != nil {
+		return x.MaxHeight
+	}
+	return 0
+}
+
+// Response message for the thumbnail generation
+type ThumbnailResponse struct {
+	state            protoimpl.MessageState `protogen:"open.v1"`
+	Message          string                 `protobuf:"bytes,1,opt,name=message,proto3" json:"message,omitempty"`                                           // Message indicating success or failure
+	ThumbnailContent []byte                 `protobuf:"bytes,2,opt,name=thumbnail_content,json=thumbnailContent,proto3" json:"thumbnail_content,omitempty"` // Thumbnail content as bytes
+	unknownFields    protoimpl.UnknownFields
+	sizeCache        protoimpl.SizeCache
+}
+
+func (x *ThumbnailResponse) Reset() {
+	*x = ThumbnailResponse{}
+	mi := &file_thumbnail_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ThumbnailResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ThumbnailResponse) ProtoMessage() {}
+
+func (x *ThumbnailResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_thumbnail_proto_msgTypes[1]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ThumbnailResponse.ProtoReflect.Descriptor instead.
+func (*ThumbnailResponse) Descriptor() ([]byte, []int) {
+	return file_thumbnail_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *ThumbnailResponse) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
+func (x *ThumbnailResponse) GetThumbnailContent() []byte {
+	if x != nil {
+		return x.ThumbnailContent
+	}
+	return nil
+}
+
+var File_thumbnail_proto protoreflect.FileDescriptor
+
+const file_thumbnail_proto_rawDesc = "" +
+	"\n" +
+	"\x0fthumbnail.proto\x12\x11thumbnail_service\"\xab\x01\n" +
+	"\x10ThumbnailRequest\x12!\n" +
+	"\ffile_content\x18\x01 \x01(\fR\vfileContent\x128\n" +
+	"\tfile_type\x18\x02 \x01(\x0e2\x1b.thumbnail_service.FileTypeR\bfileType\x12\x1b\n" +
+	"\tmax_width\x18\x03 \x01(\x05R\bmaxWidth\x12\x1d\n" +
+	"\n" +
+	"max_height\x18\x04 \x01(\x05R\tmaxHeight\"Z\n" +
+	"\x11ThumbnailResponse\x12\x18\n" +
+	"\amessage\x18\x01 \x01(\tR\amessage\x12+\n" +
+	"\x11thumbnail_content\x18\x02 \x01(\fR\x10thumbnailContent*D\n" +
+	"\bFileType\x12\x19\n" +
+	"\x15FILE_TYPE_UNSPECIFIED\x10\x00\x12\t\n" +
+	"\x05IMAGE\x10\x01\x12\t\n" +
+	"\x05VIDEO\x10\x02\x12\a\n" +
+	"\x03PDF\x10\x032r\n" +
+	"\x10ThumbnailService\x12^\n" +
+	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponseB\tZ\a./protob\x06proto3"
+
+var (
+	file_thumbnail_proto_rawDescOnce sync.Once
+	file_thumbnail_proto_rawDescData []byte
+)
+
+func file_thumbnail_proto_rawDescGZIP() []byte {
+	file_thumbnail_proto_rawDescOnce.Do(func() {
+		file_thumbnail_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_thumbnail_proto_rawDesc), len(file_thumbnail_proto_rawDesc)))
+	})
+	return file_thumbnail_proto_rawDescData
+}
+
+var file_thumbnail_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_thumbnail_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_thumbnail_proto_goTypes = []any{
+	(FileType)(0),             // 0: thumbnail_service.FileType
+	(*ThumbnailRequest)(nil),  // 1: thumbnail_service.ThumbnailRequest
+	(*ThumbnailResponse)(nil), // 2: thumbnail_service.ThumbnailResponse
+}
+var file_thumbnail_proto_depIdxs = []int32{
+	0, // 0: thumbnail_service.ThumbnailRequest.file_type:type_name -> thumbnail_service.FileType
+	1, // 1: thumbnail_service.ThumbnailService.GenerateThumbnail:input_type -> thumbnail_service.ThumbnailRequest
+	2, // 2: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
+	2, // [2:3] is the sub-list for method output_type
+	1, // [1:2] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_thumbnail_proto_init() }
+func file_thumbnail_proto_init() {
+	if File_thumbnail_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_thumbnail_proto_rawDesc), len(file_thumbnail_proto_rawDesc)),
+			NumEnums:      1,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_thumbnail_proto_goTypes,
+		DependencyIndexes: file_thumbnail_proto_depIdxs,
+		EnumInfos:         file_thumbnail_proto_enumTypes,
+		MessageInfos:      file_thumbnail_proto_msgTypes,
+	}.Build()
+	File_thumbnail_proto = out.File
+	file_thumbnail_proto_goTypes = nil
+	file_thumbnail_proto_depIdxs = nil
+}

server/proto/thumbnail_grpc.pb.go

@@ -0,0 +1,125 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v3.21.12
+// source: thumbnail.proto
+
+package proto
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	ThumbnailService_GenerateThumbnail_FullMethodName = "/thumbnail_service.ThumbnailService/GenerateThumbnail"
+)
+
+// ThumbnailServiceClient is the client API for ThumbnailService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+//
+// Service definition
+type ThumbnailServiceClient interface {
+	GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error)
+}
+
+type thumbnailServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewThumbnailServiceClient(cc grpc.ClientConnInterface) ThumbnailServiceClient {
+	return &thumbnailServiceClient{cc}
+}
+
+func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ThumbnailResponse)
+	err := c.cc.Invoke(ctx, ThumbnailService_GenerateThumbnail_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ThumbnailServiceServer is the server API for ThumbnailService service.
+// All implementations must embed UnimplementedThumbnailServiceServer
+// for forward compatibility.
+//
+// Service definition
+type ThumbnailServiceServer interface {
+	GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error)
+	mustEmbedUnimplementedThumbnailServiceServer()
+}
+
+// UnimplementedThumbnailServiceServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedThumbnailServiceServer struct{}
+
+func (UnimplementedThumbnailServiceServer) GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GenerateThumbnail not implemented")
+}
+func (UnimplementedThumbnailServiceServer) mustEmbedUnimplementedThumbnailServiceServer() {}
+func (UnimplementedThumbnailServiceServer) testEmbeddedByValue()                          {}
+
+// UnsafeThumbnailServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ThumbnailServiceServer will
+// result in compilation errors.
+type UnsafeThumbnailServiceServer interface {
+	mustEmbedUnimplementedThumbnailServiceServer()
+}
+
+func RegisterThumbnailServiceServer(s grpc.ServiceRegistrar, srv ThumbnailServiceServer) {
+	// If the following call pancis, it indicates UnimplementedThumbnailServiceServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&ThumbnailService_ServiceDesc, srv)
+}
+
+func _ThumbnailService_GenerateThumbnail_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ThumbnailRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ThumbnailServiceServer).GenerateThumbnail(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ThumbnailService_GenerateThumbnail_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ThumbnailServiceServer).GenerateThumbnail(ctx, req.(*ThumbnailRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ThumbnailService_ServiceDesc is the grpc.ServiceDesc for ThumbnailService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ThumbnailService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "thumbnail_service.ThumbnailService",
+	HandlerType: (*ThumbnailServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "GenerateThumbnail",
+			Handler:    _ThumbnailService_GenerateThumbnail_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "thumbnail.proto",
+}

thumbnail.proto

@@ -0,0 +1,32 @@
+syntax = "proto3";
+
+package thumbnail_service;
+
+option go_package = "./proto";
+
+// Enum for the file type
+enum FileType {
+    FILE_TYPE_UNSPECIFIED = 0;  // Default value for unspecified file type
+    IMAGE = 1;                  // Image file
+    VIDEO = 2;                  // Video file
+    PDF = 3;                    // PDF file
+}
+
+// Service definition
+service ThumbnailService {
+    rpc GenerateThumbnail(ThumbnailRequest) returns (ThumbnailResponse);
+}
+
+// Request message for generating thumbnails
+message ThumbnailRequest {
+    bytes file_content = 1; // File content as bytes
+    FileType file_type = 2; // File type (image, video, pdf)
+    int32 max_width = 3;     // Optional max width for resizing (0 means no limit)
+    int32 max_height = 4;    // Optional max height for resizing (0 means no limit)
+}
+
+// Response message for the thumbnail generation
+message ThumbnailResponse {
+    string message = 1;           // Message indicating success or failure
+    bytes thumbnail_content = 2;  // Thumbnail content as bytes
+}