replace curl with fetch, v0.1.6

package.json

@@ -1,6 +1,6 @@
 {
   "name": "wiki-plugin-datalog",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "description": "Federated Wiki - Datalog Plugin",
   "keywords": [
     "datalog",

server/server.js

@@ -87,6 +87,13 @@
       return offset*year
     }
 
+    function timeout(duration) {
+      // https://stackoverflow.com/a/49857905
+      return new Promise((_, reject) =>
+        setTimeout(() => reject(new Error(`timeout after ${duration} msec`)), duration))
+    }
+
+
     function activate(slugitem) {
 
       console.log('activate', slugitem)
@@ -103,12 +110,6 @@
       //   return `${assets}/plugins/datalog/${slug}/${utc(new Date(clock),chunk)}.log`
       // }
 
-      function timeout(duration) {
-        // https://stackoverflow.com/a/49857905
-        return new Promise((_, reject) =>
-          setTimeout(() => reject(new Error(`timeout after ${duration} msec`)), duration))
-      }
-
       function sample() {
 
         let clock = Date.now()
@@ -241,17 +242,29 @@
     })
 
     app.get('/plugin/datalog/curl', cors, (req, res) => {
-      console.log(req.query)
-      let curl = `curl -m 3 -s '${req.query.url}'`
+      let url = /^http/.test(req.query.url) ? req.query.url : `http://${req.query.url}`
       let t0 = Date.now()
-      exec(curl, (err, stdout, stderr) => {
-        let sample = {
-          exit: err ? err.code : 0,
-          time: Date.now() - t0,
-          stdout: stdout.length,
-          stderr: stderr.length
-        }
+
+      function send(sample) {
+        sample.time = Date.now() - t0
         res.send(JSON.stringify(sample))
+      }
+
+      Promise.race([
+        fetch(url,{redirect:'manual'}),
+        timeout(3000)
+      ])
+      .then(response => {
+        if (!response.ok && !response.status==302) {
+          return send({exit: 1, error: response.statusText, code: response.status})
+        }
+        return response.text()
+      })
+      .then(data => {
+        return send({exit: 0, stdout:data.length})
+      })
+      .catch(error => {
+        return send({exit: 2, error: error.message})
       })
     })