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