-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
First commit: Plain HTTP server + SMTP client for POST /email
- Loading branch information
0 parents
commit e03c48f
Showing
12 changed files
with
342 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,17 @@ | ||
{ | ||
"name": "corentin-regent/portfolio-back", | ||
"image": "mcr.microsoft.com/devcontainers/go:bookworm", | ||
"features": { | ||
"ghcr.io/devcontainers/features/docker-in-docker": {} | ||
}, | ||
"customizations": { | ||
"vscode": { | ||
"extensions": [ | ||
"bierner.markdown-preview-github-styles", | ||
"github.vscode-github-actions", | ||
"ms-azuretools.vscode-docker", | ||
"yzhang.markdown-all-in-one" | ||
] | ||
} | ||
} | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,17 @@ | ||
version: 2 | ||
updates: | ||
- package-ecosystem: github-actions | ||
directory: / | ||
schedule: | ||
interval: weekly | ||
|
||
- package-ecosystem: gomod | ||
directory: / | ||
schedule: | ||
interval: weekly | ||
groups: | ||
dependencies: | ||
applies-to: version-updates | ||
update-types: | ||
- minor | ||
- patch |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,3 @@ | ||
env.sh | ||
|
||
/portfolio-back |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,21 @@ | ||
MIT License | ||
|
||
Copyright (c) 2024 Corentin Régent | ||
|
||
Permission is hereby granted, free of charge, to any person obtaining a copy | ||
of this software and associated documentation files (the "Software"), to deal | ||
in the Software without restriction, including without limitation the rights | ||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
|
||
The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
|
||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,3 @@ | ||
# Backend for my portfolio website | ||
|
||
This is a Work In Progress |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,176 @@ | ||
package api | ||
|
||
import ( | ||
"context" | ||
"crypto/tls" | ||
"encoding/json" | ||
"fmt" | ||
"log" | ||
"net" | ||
"net/http" | ||
"net/smtp" | ||
"net/url" | ||
"sync" | ||
) | ||
|
||
const smtpsPort = "587" | ||
|
||
type smtpServer struct { | ||
Host string | ||
Port string | ||
} | ||
|
||
func (server *smtpServer) Name() string { | ||
return server.Host + ":" + server.Port | ||
} | ||
|
||
type postEmailData struct { | ||
Sender string | ||
Subject string | ||
Body string | ||
SuccessRedirectUrl string | ||
} | ||
|
||
func HandleEmail( | ||
appContext context.Context, | ||
shutdownWaitGroup *sync.WaitGroup, | ||
getEnv func(string) string, | ||
) func(http.ResponseWriter, *http.Request) { | ||
|
||
smtpClientDomain := getEnv("SMTP_CLIENT_DOMAIN") | ||
smtpServerDomain := getEnv("SMTP_SERVER_DOMAIN") | ||
targetEmailAddress := getEnv("TARGET_EMAIL_ADDRESS") | ||
sourceEmailAddress := getEnv("SOURCE_EMAIL_ADDRESS") | ||
sourceEmailPassword := getEnv("SOURCE_EMAIL_PASSWORD") | ||
|
||
var ( | ||
initSmtp sync.Once | ||
smtpClient *smtp.Client | ||
smtpSetupErr error | ||
) | ||
|
||
buildMessage := func(email *postEmailData) string { | ||
return fmt.Sprintf("To: %s\r\nSubject: %s\r\n\r\n%s\r\n\r\nSent by %s", targetEmailAddress, email.Subject, email.Body, email.Sender) | ||
} | ||
|
||
setupSmtpClient := func() (client *smtp.Client, err error) { | ||
server := smtpServer{ | ||
Host: smtpServerDomain, | ||
Port: smtpsPort, | ||
} | ||
tlsConfig := &tls.Config{ | ||
ServerName: server.Host, | ||
} | ||
auth := smtp.PlainAuth("", sourceEmailAddress, sourceEmailPassword, server.Host) | ||
|
||
log.Println("[DEBUG] Establishing TCP connection with SMTP server") | ||
conn, err := net.Dial("tcp", server.Name()) | ||
if err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Creating SMTP client") | ||
client, err = smtp.NewClient(conn, server.Host) | ||
if err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Sending HELLO to SMTP server") | ||
if err = client.Hello(smtpClientDomain); err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Negotiating TLS encryption for SMTP communication") | ||
if err = client.StartTLS(tlsConfig); err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Authenticating to the SMTP server") | ||
err = client.Auth(auth) | ||
return | ||
} | ||
|
||
sendEmail := func(client *smtp.Client, email *postEmailData) (err error) { | ||
log.Println("[DEBUG] Setting SMTP email sender") | ||
if err = client.Mail(sourceEmailAddress); err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Setting SMTP email receiver") | ||
if err = client.Rcpt(targetEmailAddress); err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Starting SMTP email body") | ||
messageWriter, err := client.Data() | ||
if err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Writing SMTP email body") | ||
_, err = messageWriter.Write([]byte(buildMessage(email))) | ||
if err != nil { | ||
return | ||
} | ||
log.Println("[DEBUG] Sending SMTP email") | ||
err = messageWriter.Close() | ||
return | ||
} | ||
|
||
failPostEmail := func(response http.ResponseWriter, request *http.Request, email postEmailData, err error) { | ||
log.Printf("[ERROR] POST /email failed: %s\n", err) | ||
failureRedirectUrl := fmt.Sprintf( | ||
"mailto:%s?subject=%s&body=%s", | ||
targetEmailAddress, | ||
url.PathEscape(email.Subject), | ||
url.PathEscape(email.Body), | ||
) | ||
http.Redirect(response, request, failureRedirectUrl, http.StatusSeeOther) | ||
} | ||
|
||
handlePostEmail := func(response http.ResponseWriter, request *http.Request) { | ||
decoder := json.NewDecoder(request.Body) | ||
var email postEmailData | ||
err := decoder.Decode(&email) | ||
if err != nil { | ||
http.Error(response, err.Error(), http.StatusBadRequest) | ||
} | ||
|
||
initSmtp.Do(func() { | ||
log.Println("[INFO] Setting up SMTP client") | ||
smtpClient, smtpSetupErr = setupSmtpClient() | ||
if smtpSetupErr == nil { | ||
log.Println("[INFO] SMTP client is ready") | ||
} else { | ||
log.Printf("[ERROR] SMTP client setup failed: %s\n", smtpSetupErr) | ||
} | ||
}) | ||
if smtpSetupErr != nil { | ||
failPostEmail(response, request, email, smtpSetupErr) | ||
return | ||
} | ||
|
||
err = sendEmail(smtpClient, &email) | ||
if err == nil { | ||
http.Redirect(response, request, email.SuccessRedirectUrl, http.StatusFound) | ||
} else { | ||
failPostEmail(response, request, email, err) | ||
} | ||
} | ||
|
||
shutdownWaitGroup.Add(1) | ||
listenForShutdown := func() { | ||
<-appContext.Done() | ||
if smtpClient != nil { | ||
log.Println("[INFO] Shutting down SMTP client") | ||
err := smtpClient.Quit() | ||
if err != nil { | ||
log.Printf("[ERROR] SMTP client shutdown failed: %s\n", err.Error()) | ||
} | ||
} | ||
shutdownWaitGroup.Done() | ||
} | ||
|
||
go listenForShutdown() | ||
return func(response http.ResponseWriter, request *http.Request) { | ||
switch request.Method { | ||
case http.MethodPost: | ||
handlePostEmail(response, request) | ||
default: | ||
http.Error(response, fmt.Sprintf("unexpected method %q", request.Method), http.StatusBadRequest) | ||
} | ||
} | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,5 @@ | ||
module portfolio-back | ||
|
||
go 1.22.6 | ||
|
||
require github.com/rs/cors v1.11.0 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,2 @@ | ||
github.com/rs/cors v1.11.0 h1:0B9GE/r9Bc2UxRMMtymBkHTenPkHDv0CW4Y98GBY+po= | ||
github.com/rs/cors v1.11.0/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU= |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,20 @@ | ||
package main | ||
|
||
import ( | ||
"context" | ||
"net/http" | ||
"sync" | ||
|
||
"portfolio-back/middleware" | ||
) | ||
|
||
func NewHandler( | ||
appContext context.Context, | ||
shutdownWaitGroup *sync.WaitGroup, | ||
getEnv func(string) string, | ||
) http.Handler { | ||
serveMux := http.NewServeMux() | ||
InstallRoutes(serveMux, appContext, shutdownWaitGroup, getEnv) | ||
var handler http.Handler = middleware.Cors(serveMux, getEnv) | ||
return handler | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,44 @@ | ||
package main | ||
|
||
import ( | ||
"context" | ||
"errors" | ||
"log" | ||
"net/http" | ||
"os" | ||
"os/signal" | ||
"sync" | ||
) | ||
|
||
func run(appContext context.Context, getEnv func(string) string) { | ||
shutdownWaitGroup := &sync.WaitGroup{} | ||
handler := NewHandler(appContext, shutdownWaitGroup, getEnv) | ||
server := &http.Server{ | ||
Addr: ":" + getEnv("HTTP_SERVER_PORT"), | ||
Handler: handler, | ||
} | ||
go serve(server) | ||
waitUntilShutdown(server, shutdownWaitGroup) | ||
} | ||
|
||
func serve(server *http.Server) { | ||
log.Println("[INFO] HTTP server listening") | ||
err := server.ListenAndServe() | ||
if !errors.Is(err, http.ErrServerClosed) { | ||
log.Printf("[ERROR] HTTP server crashed: %s\n", err) | ||
} | ||
} | ||
|
||
func waitUntilShutdown(server *http.Server, shutdownWaitGroup *sync.WaitGroup) { | ||
shutdownWaitGroup.Wait() | ||
log.Println("[INFO] Shutting down HTTP server") | ||
err := server.Shutdown(context.Background()) | ||
if err != nil { | ||
log.Printf("[ERROR] HTTP server shutdown failed: %s\n", err) | ||
} | ||
} | ||
|
||
func main() { | ||
appContext, _ := signal.NotifyContext(context.Background(), os.Interrupt) | ||
run(appContext, os.Getenv) | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,16 @@ | ||
package middleware | ||
|
||
import ( | ||
"net/http" | ||
"strings" | ||
|
||
"github.com/rs/cors" | ||
) | ||
|
||
func Cors(handler http.Handler, getEnv func(string) string) http.Handler { | ||
corsConfig := cors.Options{ | ||
AllowedOrigins: strings.Split(getEnv("CORS_ALLOWED_ORIGINS"), " "), | ||
AllowedMethods: []string{http.MethodPost}, | ||
} | ||
return cors.New(corsConfig).Handler(handler) | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,18 @@ | ||
package main | ||
|
||
import ( | ||
"context" | ||
"net/http" | ||
"sync" | ||
|
||
"portfolio-back/api" | ||
) | ||
|
||
func InstallRoutes( | ||
serveMux *http.ServeMux, | ||
appContext context.Context, | ||
shutdownWaitGroup *sync.WaitGroup, | ||
getEnv func(string) string, | ||
) { | ||
serveMux.HandleFunc("/email", api.HandleEmail(appContext, shutdownWaitGroup, getEnv)) | ||
} |