cater for self hosted draw.io

2026-01-12 15:08:27 +11:00
parent c832d65fae
commit a08f7d8782
3 changed files with 10 additions and 1 deletions
--- a/README.md
+++ b/README.md
@@ -27,6 +27,7 @@ The HTTP server exposes a simple REST endpoint plus docs.

 - Swagger UI: `http://localhost:8080/swagger`
 - OpenAPI spec: `http://localhost:8080/openapi.json`
+- diagrams.net host override: set environment variable `DRAWIO_BASE_URL` (defaults to `https://app.diagrams.net`)

 ### Endpoint
 `POST /api/convert`
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"os"
 	"strings"
 	"time"

@@ -24,6 +25,8 @@ var diagramStore = struct {
 	data: make(map[string]string),
 }

+var drawioBaseURL = "https://app.diagrams.net"
+
 var uploadTpl = template.Must(template.New("upload").Parse(`
 <!doctype html>
 <html lang="en">
@@ -133,6 +136,9 @@ type apiResponse struct {
 }

 func main() {
+	if v := strings.TrimSpace(os.Getenv("DRAWIO_BASE_URL")); v != "" {
+		drawioBaseURL = strings.TrimRight(v, "/")
+	}
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", uploadHandler)
 	mux.HandleFunc("/convert", uploadConvertHandler)
@@ -330,7 +336,7 @@ func buildDiagramsNetURL(r *http.Request, id string) string {
 	}
 	base := fmt.Sprintf("%s://%s/diagram?id=%s", scheme, r.Host, url.QueryEscape(id))
 	// Request AWS library for custom shapes (e.g., aws4) to render correctly.
-	return "https://app.diagrams.net/?splash=0&ui=min&libs=aws4&url=" + url.QueryEscape(base)
+	return drawioBaseURL + "/?splash=0&ui=min&libs=aws4&url=" + url.QueryEscape(base)
 }

 func addCORS(w http.ResponseWriter) {
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,4 +5,6 @@ services:
    build: .
    ports:
      - "8080:8080"
+    environment:
+      - DRAWIO_BASE_URL=${DRAWIO_BASE_URL:-https://app.diagrams.net}
    restart: unless-stopped