Merge pull request #6: git-bundle-web-server: simple web-server process

The `git-bundle-web-server` process runs the server process. It performs a very basic form of routing to ensure that the input route is still in the `routes` file, then serves the `bundle-list` or the requested `.bundle` file.

Author: derrickstolee

.github/workflows/main.yml

@@ -20,10 +20,12 @@ jobs:
         run: |
           cd $GITHUB_WORKSPACE/src/git-bundle-server
           GOPATH="$GITHUB_WORKSPACE/../../" go build ./cmd/git-bundle-server
+          GOPATH="$GITHUB_WORKSPACE/../../" go build ./cmd/git-bundle-web-server
 
       - name: Check style
         run: |
           cd $GITHUB_WORKSPACE/src/git-bundle-server
           GOPATH="$GITHUB_WORKSPACE/../../" go vet ./cmd/git-bundle-server
+          GOPATH="$GITHUB_WORKSPACE/../../" go vet ./cmd/git-bundle-web-server
 
       # TODO: add automated tests.

.gitignore

@@ -1 +1,2 @@
 /git-bundle-server
+/git-bundle-web-server

cmd/git-bundle-web-server/go.mod

@@ -0,0 +1,3 @@
+module github.com/github/git-bundle-server/cmd/git-bundle-web-server
+
+go 1.19

cmd/git-bundle-web-server/main.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/github/git-bundle-server/internal/core"
+)
+
+func parseRoute(path string) (string, string, string, error) {
+	if len(path) == 0 {
+		return "", "", "", fmt.Errorf("empty route")
+	}
+
+	if path[0] == '/' {
+		path = path[1:]
+	}
+
+	slash1 := strings.Index(path, "/")
+	if slash1 < 0 {
+		return "", "", "", fmt.Errorf("route has owner, but no repo")
+	}
+	slash2 := strings.Index(path[slash1+1:], "/")
+	if slash2 < 0 {
+		// No trailing slash.
+		return path[:slash1], path[slash1+1:], "", nil
+	}
+	slash2 += slash1 + 1
+	slash3 := strings.Index(path[slash2+1:], "/")
+	if slash3 >= 0 {
+		return "", "", "", fmt.Errorf("path has depth exceeding three")
+	}
+
+	return path[:slash1], path[slash1+1 : slash2], path[slash2+1:], nil
+}
+
+func serve(w http.ResponseWriter, r *http.Request) {
+	path := r.URL.Path
+
+	owner, repo, file, err := parseRoute(path)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Printf("Failed to parse route: %s\n", err)
+		return
+	}
+
+	route := owner + "/" + repo
+
+	repos, err := core.GetRepositories()
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Printf("Failed to load routes\n")
+		return
+	}
+
+	repository, contains := repos[route]
+	if !contains {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Printf("Failed to get route out of repos\n")
+		return
+	}
+
+	if file == "" {
+		file = "bundle-list"
+	}
+
+	fileToServe := repository.WebDir + "/" + file
+	data, err := os.ReadFile(fileToServe)
+	if err != nil {
+		w.WriteHeader(http.StatusNotFound)
+		fmt.Printf("Failed to read file\n")
+		return
+	}
+
+	fmt.Printf("Successfully serving content for %s/%s\n", route, file)
+	w.Write(data)
+}
+
+func main() {
+	// API routes
+	http.HandleFunc("/", serve)
+
+	port := ":8080"
+	fmt.Println("Server is running on port" + port)
+
+	// Start server on port specified above
+	log.Fatal(http.ListenAndServe(port, nil))
+}

go.work

@@ -2,6 +2,7 @@ go 1.18
 
 use (
 	./cmd/git-bundle-server/
+	./cmd/git-bundle-web-server/
 	./internal/bundles/
 	./internal/core/
 	./internal/git/