Support for attachments and UTF-8 subjects

.github/workflows/docker.yml

@@ -0,0 +1,50 @@
+name: Docker
+
+on:
+  push:
+    branches: [master]
+    tags:
+      - v[0-9]+.[0-9]+.[0-9]+*
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    name: Build image
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/gotify
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+            type=edge
+            type=ref,event=pr  
+
+      - name: Build Docker image (and push on main)
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -1,6 +1,6 @@
 # Dockerfile for gotify production
-FROM golang:alpine AS buildStage
-MAINTAINER digIT <digit@chalmers.it>
+FROM golang:alpine3.21 AS buildStage
+LABEL maintainer="digIT <digit@chalmers.it>"
 
 # Install git
 RUN apk update
@@ -12,18 +12,15 @@
 COPY . $GOPATH/src/github.com/cthit/gotify
 WORKDIR $GOPATH/src/github.com/cthit/gotify/cmd
 
-# Grab dependencies
-RUN go get -d -v ./...
-
-# build binary
+# Build binary
 RUN go install -v
 RUN mkdir /app && mv $GOPATH/bin/cmd /app/gotify
 
 ##########################
 #    PRODUCTION STAGE    #
 ##########################
 FROM alpine
-MAINTAINER digIT <digit@chalmers.it>
+LABEL maintainer="digIT <digit@chalmers.it>"
 
 # Add standard certificates
 RUN apk update && apk add ca-certificates && rm -rf /var/cache/apk/*
@@ -38,4 +35,4 @@
 
 # Set good defaults
 WORKDIR /app
 ENTRYPOINT /app/gotify

README.md

@@ -16,12 +16,19 @@ All request must inclue a header with the preshared key.
 POST `/mail`
 
 Json Request:
-```
+```json5
 {
     "to": "....",
     "from": "....",
     "subject": "....",
-    "body": "...."
+    "body": "....",
+    "attachments": [
+        {
+            "name": "....",        // File name
+            "data": "....",        // Base64 encoded file
+            "content_type": "...." // MIME type
+        }
+    ]
 }
 ```
 
@@ -40,6 +47,7 @@ port = "8080"
 pre-shared-key = "......"
 debug-mode = false
 mock-mode = false
+max-mail-size = 20000000
 
 [google-mail]
     keyfile = "gapps.json"
@@ -51,6 +59,7 @@ See [Environment Variables](#environment-variables) for config explanation
 * `GOTIFY_PORT`: Port for the web service, defaults to `8080` (string)
 * `GOTIFY_PRE-SHARED-KEY`*: Random string used by other apps to authenticate
 * `GOTIFY_DEBUG-MODE`: Bool indicating debug mode defaults to `false`
+* `GOTIFY_MAX-MAIL-SIZE`: The maximum size of an email in bytes, defaults to `20000000` (int)
 * `GOTIFY_GOOGLE-MAIL.KEYFILE`: the file described in [Google config file](#google-config-file) defaults to `gapps.json`
 * `GOTIFY_GOOGLE-MAIL.ADMIN-MAIL`*: The google administrator email.
 

cmd/config.go

@@ -9,6 +9,7 @@ func loadConfig() error {
 	viper.SetDefault("debug-mode", false)
 	viper.SetDefault("google-mail.keyfile", "gapps.json")
 	viper.SetDefault("mock-mode", false)
+	viper.SetDefault("max-mail-size", 20e6)
 
 	viper.SetEnvPrefix("gotify")
 	viper.AutomaticEnv()

go.mod

@@ -0,0 +1,49 @@
+module github.com/cthit/gotify
+
+go 1.23.0
+
+toolchain go1.23.7
+
+require (
+	github.com/gocraft/web v0.0.0-20190207150652-9707327fb69b
+	github.com/spf13/viper v1.20.0
+	golang.org/x/net v0.37.0
+	golang.org/x/oauth2 v0.28.0
+	google.golang.org/api v0.227.0
+)
+
+require (
+	cloud.google.com/go/auth v0.15.0 // indirect
+	cloud.google.com/go/auth/oauth2adapt v0.2.7 // indirect
+	cloud.google.com/go/compute/metadata v0.6.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
+	github.com/google/s2a-go v0.1.9 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
+	github.com/googleapis/gax-go/v2 v2.14.1 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
+	github.com/sagikazarmark/locafero v0.7.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.12.0 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.59.0 // indirect
+	go.opentelemetry.io/otel v1.34.0 // indirect
+	go.opentelemetry.io/otel/metric v1.34.0 // indirect
+	go.opentelemetry.io/otel/trace v1.34.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/crypto v0.36.0 // 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
+	google.golang.org/grpc v1.71.0 // indirect
+	google.golang.org/protobuf v1.36.5 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,110 @@
+cloud.google.com/go/auth v0.15.0 h1:Ly0u4aA5vG/fsSsxu98qCQBemXtAtJf+95z9HK+cxps=
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+cloud.google.com/go/auth/oauth2adapt v0.2.7/go.mod h1:NTbTTzfvPl1Y3V1nPpOgl2w6d/FjO7NNUQaWSox6ZMc=
+cloud.google.com/go/compute/metadata v0.6.0 h1:A6hENjEsCDtC1k8byVsgwvVcioamEHvZ4j01OwKxG9I=
+cloud.google.com/go/compute/metadata v0.6.0/go.mod h1:FjyFAW1MW0C203CEOMDTu3Dk1FlqW3Rga40jzHL4hfg=
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+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
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+google.golang.org/genproto/googleapis/api v0.0.0-20250106144421-5f5ef82da422 h1:GVIKPyP/kLIyVOgOnTwFOrvQaQUzOzGMCxgFUOEmm24=
+google.golang.org/genproto/googleapis/api v0.0.0-20250106144421-5f5ef82da422/go.mod h1:b6h1vNKhxaSoEI+5jc3PJUCustfli/mRab7295pY7rw=
+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 v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
+google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

google_mail/google_service.go

@@ -1,15 +1,20 @@
 package google_mail
 
 import (
+	"fmt"
+
 	"google.golang.org/api/gmail/v1" // Imports as gmail
+	"google.golang.org/api/option"
 
 	"golang.org/x/net/context"
 	"golang.org/x/oauth2/google"
 
 	"encoding/base64"
-	"io/ioutil"
+	"os"
 
 	"github.com/cthit/gotify"
+
+	"math/rand"
 )
 
 type googleService struct {
@@ -20,7 +25,7 @@ type googleService struct {
 
 func NewGoogleMailServiceCreator(keyPath string, adminMail string, debug bool) (func() gotify.MailService, error) {
 
-	jsonKey, err := ioutil.ReadFile(keyPath)
+	jsonKey, err := os.ReadFile(keyPath)
 	if err != nil {
 		return nil, err
 	}
@@ -37,7 +42,7 @@ func NewGoogleMailServiceCreator(keyPath string, adminMail string, debug bool) (
 	// Create a http client
 	client := config.Client(context.Background())
 
-	mailService, err := gmail.New(client)
+	mailService, err := gmail.NewService(context.Background(), option.WithHTTPClient(client))
 	if err != nil {
 		return nil, err
 	}
@@ -47,9 +52,6 @@ func NewGoogleMailServiceCreator(keyPath string, adminMail string, debug bool) (
 		adminMail:   adminMail,
 		debug:       debug,
 	}
-	if err != nil {
-		return nil, err
-	}
 
 	return func() gotify.MailService {
 		return gs
@@ -59,11 +61,36 @@ func NewGoogleMailServiceCreator(keyPath string, adminMail string, debug bool) (
 func (g *googleService) SendMail(mail gotify.Mail) (gotify.Mail, error) {
 
 	mail.From = g.adminMail
-
-	msgRaw := "From: " + mail.From + "\r\n" +
-		"To: " + mail.To + "\r\n" +
-		"Subject: " + mail.Subject + "\r\n\r\n" +
-		mail.Body + "\r\n"
+	var msgRaw string
+	subject := "=?UTF-8?B?" + base64.StdEncoding.EncodeToString([]byte(mail.Subject)) + "?="
+
+	if len(mail.Attachments) > 0 {
+		boundary := fmt.Sprint("gotify-boundary-", rand.Int63())
+
+		msgRaw = "From: " + mail.From + "\r\n" +
+			"To: " + mail.To + "\r\n" +
+			"Subject: " + subject + "\r\n" +
+			"MIME-Version: 1.0\r\n" +
+			"Content-Type: multipart/mixed; boundary=" + boundary + "\r\n\r\n" +
+			"--" + boundary + "\r\n" +
+			"Content-Type: text/plain; charset=UTF-8\r\n\r\n" +
+			mail.Body + "\r\n"
+
+		for _, attachment := range mail.Attachments {
+			msgRaw += "--" + boundary + "\r\n" +
+				"Content-Type: " + attachment.ContentType + "; name=\"" + attachment.Name + "\"\r\n" +
+				"Content-Disposition: attachment; filename=\"" + attachment.Name + "\"\r\n" +
+				"Content-Transfer-Encoding: base64\r\n\r\n" +
+				attachment.Data + "\r\n"
+		}
+
+		msgRaw += "--" + boundary + "--"
+	} else {
+		msgRaw = "From: " + mail.From + "\r\n" +
+			"To: " + mail.To + "\r\n" +
+			"Subject: " + subject + "\r\n\r\n" +
+			mail.Body + "\r\n"
+	}
 
 	msg := &gmail.Message{
 		Raw: base64.RawURLEncoding.EncodeToString([]byte(msgRaw)),

mail.go

@@ -1,8 +1,15 @@
 package gotify
 
 type Mail struct {
-	To      string `json:"to"`
-	From    string `json:"from"`
-	Subject string `json:"subject"`
-	Body    string `json:"body"`
+	To          string       `json:"to"`
+	From        string       `json:"from"`
+	Subject     string       `json:"subject"`
+	Body        string       `json:"body"`
+	Attachments []Attachment `json:"attachments"`
+}
+
+type Attachment struct {
+	Name        string `json:"name"`
+	Data        string `json:"data"`
+	ContentType string `json:"content_type"`
 }