commit e69771b09f000031757fbf986b66bf0e09c20046
Author: setop <setop@zoocoop.com>
Date:   Thu Nov 28 02:45:01 2024 +0100

    first implementation

diff --git a/.tool-versions b/.tool-versions
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index 0000000..27b4d7a
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+golang 1.21.0
diff --git a/Dockerfile b/Dockerfile
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index 0000000..abb5193
--- /dev/null
+++ b/Dockerfile
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+FROM alpine
+
+RUN apk add curl
+
+COPY main .
+
+EXPOSE 5555
+
+ENTRYPOINT ["/main", "5555"]
diff --git a/README.md b/README.md
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+++ b/README.md
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+
+# Purpose
+
+This tool allows to serve static files of a git repo hosted on a gitea instance
+
+Files to be served must be published in a branch named "pages" and in a folder named "public"
+
+# Usage
+
+## standalone
+
+set GITDOMAIN environment variable, then run `go run main.go 8081`
+
+## Docker
+
+Build image using docker and run a container, setting GITDOMAIN environment variable
+
+# Limitations
+
+* serve only public repo
+* only relative links are supported
+
+# Further
+
+* perform security audit
+* find a way to serve private repo content
+* propose a standard gitea action to publish content
+* custom domains
diff --git a/cmd.txt b/cmd.txt
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index 0000000..346329f
--- /dev/null
+++ b/cmd.txt
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+
+CGO_ENABLED=0 go build main.go && strip main
+
+GITDOMAIN=git.zoocoop.com ./main 8081
+
+export VERSION=0.1.0
+docker build -t giteapages:$VERSION .
+
+docker save giteapages:$VERSION | pv | ssh kmsf2 docker load
+
+
diff --git a/main.go b/main.go
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--- /dev/null
+++ b/main.go
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+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"regexp"
+	"strings"
+)
+
+var GITDOMAIN = os.Getenv("GITDOMAIN")
+
+func main() {
+	// Get the port from command-line arguments
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: go run main.go <port>")
+		return
+	}
+	port := os.Args[1]
+
+	http.HandleFunc("/", serveFile)
+	fmt.Printf("Server is running on :%s\n", port)
+	if err := http.ListenAndServe(":"+port, nil); err != nil {
+		fmt.Println("Error starting server:", err)
+	}
+}
+
+func serveFile(w http.ResponseWriter, r *http.Request) {
+	// Parse the URL path
+	parts := strings.Split(strings.Trim(r.URL.Path, "/"), "/")
+	if len(parts) < 3 {
+		http.Error(w, "Invalid URL format", http.StatusBadRequest)
+		return
+	}
+
+	user := parts[0]
+	repo := parts[1]
+	filePath := strings.Join(parts[2:], "/")
+
+	// Construct the raw file URL
+	rawURL := fmt.Sprintf("https://%s/%s/%s/raw/branch/pages/public/%s", GITDOMAIN, user, repo, filePath)
+
+	// Fetch the content from the raw URL
+	resp, err := http.Get(rawURL)
+	if err != nil || resp.StatusCode != http.StatusOK {
+		fmt.Println("Failed to fetch file:", err)
+		http.Error(w, "Failed to fetch file", http.StatusNotFound)
+		return
+	}
+	defer resp.Body.Close()
+
+	// Read the content
+	content, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		http.Error(w, "Failed to read file content", http.StatusInternalServerError)
+		return
+	}
+
+	// Determine the content type based on the file extension
+	contentType := http.DetectContentType(content)
+	if strings.HasSuffix(filePath, ".css") {
+		contentType = "text/css"
+	} else if strings.HasSuffix(filePath, ".html") {
+		contentType = "text/html"
+	} else if strings.HasSuffix(filePath, ".js") {
+		contentType = "application/javascript"
+	} else if strings.HasSuffix(filePath, ".png") {
+		contentType = "image/png"
+	} else if strings.HasSuffix(filePath, ".jpg") || strings.HasSuffix(filePath, ".jpeg") {
+		contentType = "image/jpeg"
+	} else if strings.HasSuffix(filePath, ".gif") {
+		contentType = "image/gif"
+	}
+
+	// Rewrite links in the content
+	var rewrittenContent = content
+	if contentType == "text/html"{
+		rewrittenContent = []byte(rewriteLinks(string(content), user, repo))
+	}
+
+	// Set the content type and write the response
+	w.Header().Set("Content-Type", contentType)
+	w.Write([]byte(rewrittenContent))
+}
+
+func rewriteLinks(content, user, repo string) string {
+	// Regular expressions to match URLs
+	linkRegex := regexp.MustCompile(`(?i)(href|src)="([^"]+)"`)
+	replacedContent := linkRegex.ReplaceAllStringFunc(content, func(match string) string {
+		// Extract the URL
+		submatches := linkRegex.FindStringSubmatch(match)
+		if len(submatches) < 3 {
+			return match // Return the original match if it doesn't match
+		}
+		url := submatches[2]
+
+		// Rewrite the URL
+		rewrittenURL := rewriteURL(url, user, repo)
+		return fmt.Sprintf("%s=\"%s\"", submatches[1], rewrittenURL)
+	})
+
+	return replacedContent
+}
+
+func rewriteURL(url, user, repo string) string {
+	// Check if the URL is relative or absolute
+	if strings.HasPrefix(url, "/") {
+		// absolute URL, rewrite it
+		return fmt.Sprintf("https://%s/%s/%s/raw/branch/pages/public%s", GITDOMAIN, user, repo, url)
+	}
+	// Return the original URL if it's not relative
+	return url
+}