feat: add plugin download endpoint and improve download URL construction

server/index.js

@@ -155,13 +155,32 @@ app.get("/api/plugins", async (_req, res) => {
     }
 });
 
+function buildPluginDownloadEndpoint(ownerRepo, { provider, baseUrl, version } = {}) {
+    const [owner, repo] = ownerRepo.split("/");
+    if (!owner || !repo) {
+        return null;
+    }
+    const params = new URLSearchParams();
+    if (provider) {
+        params.set("provider", provider);
+    }
+    if (baseUrl) {
+        params.set("baseUrl", baseUrl);
+    }
+    if (version) {
+        params.set("version", version);
+    }
+    const search = params.toString();
+    return `/api/plugins/${owner}/${repo}/download${search ? `?${search}` : ""}`;
+}
+
 app.get("/api/plugins/:owner/:repo", async (req, res) => {
     const ownerRepo = `${req.params.owner}/${req.params.repo}`;
     try {
         const provider = (req.query.provider || "github").toLowerCase();
-        const baseUrl = req.query.baseUrl || (provider === "github" ? "https://github.com" : "");
-        const entry = provider === "github" ? ownerRepo : { provider, repo: ownerRepo, baseUrl };
-        const normalizedEntry = normalizeRepoInput(entry, { repo: ownerRepo, provider, baseUrl });
+        const baseUrlQuery = req.query.baseUrl || (provider === "github" ? "https://github.com" : "");
+        const entry = provider === "github" ? ownerRepo : { provider, repo: ownerRepo, baseUrl: baseUrlQuery };
+        const normalizedEntry = normalizeRepoInput(entry, { repo: ownerRepo, provider, baseUrl: baseUrlQuery });
 
         const info = await fetchRepo(entry);
         const [manifest, releases, commits] = await Promise.all([
@@ -170,13 +189,28 @@ app.get("/api/plugins/:owner/:repo", async (req, res) => {
             fetchCommits(entry).catch(() => [])
         ]);
 
+        const effectiveBaseUrl =
+            normalizedEntry?.baseUrl ||
+            baseUrlQuery ||
+            info.baseUrl ||
+            (provider === "github" ? "https://github.com" : "");
+
         const releasesWithDownload =
             normalizedEntry && releases.length > 0
                 ? releases.map((release) => {
                       const tagOrName = release.tag || release.name;
+                      if (!tagOrName) {
+                          return release;
+                      }
+                      const endpoint = buildPluginDownloadEndpoint(ownerRepo, {
+                          provider,
+                          baseUrl: effectiveBaseUrl,
+                          version: tagOrName
+                      });
                       return {
                           ...release,
-                          downloadUrl: tagOrName ? buildDownloadUrl(normalizedEntry, tagOrName, "release") : null
+                          downloadUrl: endpoint,
+                          sourceDownloadUrl: buildDownloadUrl(normalizedEntry, tagOrName, "release")
                       };
                   })
                 : releases;
@@ -187,8 +221,14 @@ app.get("/api/plugins/:owner/:repo", async (req, res) => {
             const sourceType = latestRelease ? "release" : "branch";
             const version = latestRelease?.tag || latestRelease?.name || info.defaultBranch || "main";
             if (version) {
+                const endpoint = buildPluginDownloadEndpoint(ownerRepo, {
+                    provider,
+                    baseUrl: effectiveBaseUrl,
+                    version
+                });
                 downloadMeta = {
-                    url: buildDownloadUrl(normalizedEntry, version, sourceType),
+                    url: endpoint,
+                    sourceUrl: buildDownloadUrl(normalizedEntry, version, sourceType),
                     version,
                     sourceType
                 };
@@ -207,6 +247,56 @@ app.get("/api/plugins/:owner/:repo", async (req, res) => {
     }
 });
 
+app.get("/api/plugins/:owner/:repo/download", async (req, res) => {
+    const ownerRepo = `${req.params.owner}/${req.params.repo}`;
+    try {
+        const provider = (req.query.provider || "github").toLowerCase();
+        const baseUrl = req.query.baseUrl || undefined;
+        const version = req.query.version || "latest";
+
+        if (provider === "gitea" && !baseUrl) {
+            return res.status(400).json({ error: "Gitea downloads vereisen een baseUrl." });
+        }
+
+        const repoEntry = normalizeRepoInput(
+            { repo: ownerRepo, provider, baseUrl },
+            { repo: ownerRepo, provider, baseUrl }
+        );
+
+        if (!repoEntry) {
+            return res.status(400).json({ error: "Ongeldige repository." });
+        }
+
+        const source = await resolveRepoDownload(repoEntry, version);
+        const remoteResponse = await fetch(source.url);
+        if (!remoteResponse.ok || !remoteResponse.body) {
+            return res.status(502).json({ error: "Kon plugin versie niet downloaden." });
+        }
+
+        res.setHeader("Content-Type", remoteResponse.headers.get("content-type") || "application/zip");
+        const length = remoteResponse.headers.get("content-length");
+        if (length) {
+            res.setHeader("Content-Length", length);
+        }
+        res.setHeader("Content-Disposition", `attachment; filename="${source.filename}"`);
+        res.setHeader("X-Plugin-Version", source.version);
+
+        const stream = Readable.fromWeb(remoteResponse.body);
+        stream.on("error", (err) => {
+            console.error("Plugin download stream error:", err);
+            res.destroy(err);
+        });
+        stream.pipe(res);
+    } catch (error) {
+        console.error("Plugin download endpoint error:", error);
+        if (!res.headersSent) {
+            res.status(500).json({ error: "Download mislukt." });
+        } else {
+            res.end();
+        }
+    }
+});
+
 app.get("/api/licenses", requireAuth, async (req, res) => {
     try {
         let targetUserId = req.user.id;