version 1.9.0

* feat: redirect shortened URLs

* feat: accept shortened URLs in converter

* fix: tell resty not to follow redirect

* fix: remove log

.gitignore

@@ -2,4 +2,4 @@
 docker-compose.yml
 .DS_Store
 *bin
-/tmp
+/tmp

.prettierrc

@@ -0,0 +1,6 @@
+{
+    "trailingComma": "es5",
+    "tabWidth": 4,
+    "semi": false,
+    "singleQuote": true
+}

Dockerfile

@@ -1,19 +1,24 @@
-FROM golang:1.18-alpine
-
-RUN apk add musl-dev
-RUN apk add libc-dev
-RUN apk add gcc
+FROM golang:1.19-alpine as build
 
 WORKDIR /app
 
-COPY go.mod ./
-COPY go.sum ./
+COPY go.mod .
+COPY go.sum .
 
 RUN go mod download
 
-COPY ./ /app
+COPY . .
 
-RUN go build -o /anonymousoverflow
+ENV CGO_ENABLED=0
+
+RUN go build -o anonymousoverflow
+
+FROM scratch
+
+COPY --from=build /app/anonymousoverflow /anonymousoverflow
+COPY templates /templates
+COPY public /public
+COPY --from=build /etc/ssl/certs /etc/ssl/certs
 
 EXPOSE 8080
 

config/version.go

@@ -1,3 +1,3 @@
 package config
 
-var Version = "1.8.3"
+var Version = "1.9.0"

main.go

@@ -50,6 +50,8 @@ func main() {
 	r.GET("/", routes.GetHome)
 	r.POST("/", routes.PostHome)
 
+	r.GET("/a/:id", routes.RedirectShortenedOverflowURL)
+
 	r.GET("/questions/:id", func(c *gin.Context) {
 		// redirect user to the question with the title
 		c.Redirect(302, fmt.Sprintf("/questions/%s/placeholder", c.Param("id")))

public/globals.css

@@ -10,7 +10,7 @@
     --link-color: #92adff;
 }
 
-[data-theme="light"] {
+[data-theme='light'] {
     --main-bg: rgb(219, 219, 219);
     --text-color: #000;
     --muted-text-color: #636363;
@@ -26,7 +26,6 @@ a {
     color: var(--link-color);
 }
 
-
 html {
     margin: 0;
     padding: 0;
@@ -45,9 +44,9 @@ html {
 .icon img {
     background: white;
     border-radius: 50%;
-    padding: .25rem;
+    padding: 0.25rem;
 }
 
 details {
     cursor: pointer;
-}
+}

public/question.css

@@ -19,9 +19,17 @@ body {
     box-sizing: border-box;
 }
 
-.parent {
-    max-width: 90%;
-    width: fit-content;
+@media (orientation: landscape) {
+    .parent {
+        max-width: 50%;
+        width: fit-content;
+    }
+}
+@media (orientation: portrait) {
+    .parent {
+        max-width: 90%;
+        width: fit-content;
+    }
 }
 
 .header {
@@ -31,7 +39,7 @@ body {
 
 .card-tags {
     display: flex;
-    gap: .5rem;
+    gap: 0.5rem;
 }
 
 .card-tags .tag {
@@ -94,7 +102,7 @@ img {
     margin-bottom: 1rem;
     background-color: var(--meta-bg);
     color: var(--text-color);
-    
+
     display: flex;
     justify-content: space-between;
     align-items: center;

src/routes/home.go

@@ -35,10 +35,14 @@ func PostHome(c *gin.Context) {
 
 	soLink := body.URL
 
+	// remove the www.
+	soLink = strings.ReplaceAll(soLink, "www.", "")
+
 	// validate URL
 	isStackOverflow := strings.HasPrefix(soLink, "https://stackoverflow.com/questions/")
+	isShortenedStackOverflow := strings.HasPrefix(soLink, "https://stackoverflow.com/a/")
 	isStackExchange := stackExchangeRegex.MatchString(soLink)
-	if !isStackExchange && !isStackOverflow {
+	if !isStackExchange && !isStackOverflow && !isShortenedStackOverflow {
 		c.HTML(400, "home.html", gin.H{
 			"errorMessage": "Invalid stack overflow/exchange URL",
 			"theme":        c.MustGet("theme").(string),
@@ -47,7 +51,7 @@ func PostHome(c *gin.Context) {
 	}
 
 	// if stack overflow, trim https://stackoverflow.com
-	if isStackOverflow {
+	if isStackOverflow || isShortenedStackOverflow {
 		c.Redirect(302, strings.TrimPrefix(soLink, "https://stackoverflow.com"))
 		return
 	}

src/routes/shortened.go

@@ -0,0 +1,44 @@
+package routes
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/gin-gonic/gin"
+	"github.com/go-resty/resty/v2"
+)
+
+func RedirectShortenedOverflowURL(c *gin.Context) {
+	id := c.Param("id")
+
+	// fetch the stack overflow URL
+	client := resty.New()
+	client.SetRedirectPolicy(
+		resty.RedirectPolicyFunc(func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		}),
+	)
+
+	resp, err := client.R().Get(fmt.Sprintf("https://www.stackoverflow.com/a/%s", id))
+	if err != nil {
+		c.HTML(400, "home.html", gin.H{
+			"errorMessage": "Unable to fetch stack overflow URL",
+			"theme":        c.MustGet("theme").(string),
+		})
+		return
+	}
+
+	if resp.StatusCode() != 302 {
+		c.HTML(400, "home.html", gin.H{
+			"errorMessage": fmt.Sprintf("Unexpected HTTP status from origin: %d", resp.StatusCode()),
+			"theme":        c.MustGet("theme").(string),
+		})
+		return
+	}
+
+	// get the redirect URL
+	location := resp.Header().Get("Location")
+
+	c.Redirect(302, fmt.Sprintf("%s%s", os.Getenv("APP_URL"), location))
+}

src/utils/images.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"regexp"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/golang-jwt/jwt/v4"
@@ -14,20 +15,28 @@ import (
 var imgTagRegex = regexp.MustCompile(`<img[^>]*\s+src\s*=\s*"(.*?)"[^>]*>`)
 
 func ReplaceImgTags(inHtml string) string {
-	// find all img tags
 	imgTags := imgTagRegex.FindAllString(inHtml, -1)
 
+	var wg sync.WaitGroup
+	var mu sync.Mutex
+
 	for _, imgTag := range imgTags {
-		// parse the src="" attribute
-		srcRegex := regexp.MustCompile(`src\s*=\s*"(.*?)"`)
-		src := srcRegex.FindStringSubmatch(imgTag)[1]
+		wg.Add(1)
+		go func(imgTag string) {
+			defer wg.Done()
+			srcRegex := regexp.MustCompile(`src\s*=\s*"(.*?)"`)
+			src := srcRegex.FindStringSubmatch(imgTag)[1]
 
-		authToken, _ := generateImageProxyAuth(src)
+			authToken, _ := generateImageProxyAuth(src)
 
-		// replace the img tag with a proxied url
-		inHtml = strings.Replace(inHtml, imgTag, fmt.Sprintf(`<img src="%s/proxy?auth=%s">`, os.Getenv("APP_URL"), authToken), 1)
+			mu.Lock()
+			defer mu.Unlock()
+			inHtml = strings.Replace(inHtml, imgTag, fmt.Sprintf(`<img src="%s/proxy?auth=%s">`, os.Getenv("APP_URL"), authToken), 1)
+		}(imgTag)
 	}
 
+	wg.Wait()
+
 	return inHtml
 }