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node_modules/needle/lib/multipart.js

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+var readFile = require('fs').readFile,
+    basename = require('path').basename;
+
+exports.build = function(data, boundary, callback) {
+
+  if (typeof data != 'object' || typeof data.pipe == 'function')
+    return callback(new Error('Multipart builder expects data as key/val object.'));
+
+  var body   = '',
+      object = flatten(data),
+      count  = Object.keys(object).length;
+
+  if (count === 0)
+    return callback(new Error('Empty multipart body. Invalid data.'))
+
+  function done(err, section) {
+    if (err) return callback(err);
+    if (section) body += section;
+    --count || callback(null, body + '--' + boundary + '--');
+  };
+
+  for (var key in object) {
+    var value = object[key];
+    if (value === null || typeof value == 'undefined') {
+      done();
+    } else if (Buffer.isBuffer(value)) {
+      var part = { buffer: value, content_type: 'application/octet-stream' };
+      generate_part(key, part, boundary, done);
+    } else {
+      var part = (value.buffer || value.file || value.content_type) ? value : { value: value };
+      generate_part(key, part, boundary, done);
+    }
+  }
+
+}
+
+function generate_part(name, part, boundary, callback) {
+
+  var return_part = '--' + boundary + '\r\n';
+  return_part += 'Content-Disposition: form-data; name="' + name + '"';
+
+  function append(data, filename) {
+
+    if (data) {
+      var binary = part.content_type.indexOf('text') == -1;
+      return_part += '; filename="' + encodeURIComponent(filename) + '"\r\n';
+      if (binary) return_part += 'Content-Transfer-Encoding: binary\r\n';
+      return_part += 'Content-Type: ' + part.content_type + '\r\n\r\n';
+      return_part += binary ? data.toString('binary') : data.toString('utf8');
+    }
+
+    callback(null, return_part + '\r\n');
+  };
+
+  if ((part.file || part.buffer) && part.content_type) {
+
+    var filename = part.filename ? part.filename : part.file ? basename(part.file) : name;
+    if (part.buffer) return append(part.buffer, filename);
+
+    readFile(part.file, function(err, data) {
+      if (err) return callback(err);
+      append(data, filename);
+    });
+
+  } else {
+
+    if (typeof part.value == 'object')
+      return callback(new Error('Object received for ' + name + ', expected string.'))
+
+    if (part.content_type) {
+      return_part += '\r\n';
+      return_part += 'Content-Type: ' + part.content_type;
+    }
+
+    return_part += '\r\n\r\n';
+    return_part += Buffer.from(String(part.value), 'utf8').toString('binary');
+    append();
+
+  }
+
+}
+
+// flattens nested objects for multipart body
+function flatten(object, into, prefix) {
+  into = into || {};
+
+  for(var key in object) {
+    var prefix_key = prefix ? prefix + '[' + key + ']' : key;
+    var prop = object[key];
+
+    if (prop && typeof prop === 'object' && !(prop.buffer || prop.file || prop.content_type))
+      flatten(prop, into, prefix_key)
+    else
+      into[prefix_key] = prop;
+  }
+
+  return into;
+}