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(#2832) - implement multipart/related
If a document contains non-stub attachments, then upload them as multipart-related instead of application/json.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| 'use strict'; | ||
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| // Create a multipart/related stream out of a document, | ||
| // so we can upload documents in that format when | ||
| // attachments are large. This is shamefully stolen from | ||
| // https://github.com/sballesteros/couch-multipart-stream/ | ||
| // and https://github.com/npm/npm-fullfat-registry | ||
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| var base64 = require('./base64'); | ||
| var uuid = require('./uuid'); | ||
| var utils = require('../utils'); | ||
| var isBrowser = typeof process === 'undefined' || process.browser; | ||
| var buffer = require('./buffer'); | ||
|
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| function BinaryBuilder() { | ||
| this.parts = []; | ||
| } | ||
| BinaryBuilder.prototype.append = function add(part) { | ||
| this.parts.push(part); | ||
| return this; | ||
| }; | ||
| BinaryBuilder.prototype.build = function build(type) { | ||
| if (isBrowser) { | ||
| return utils.createBlob(this.parts, {type: type}); | ||
| } | ||
| return buffer.concat(this.parts.map(function (part) { | ||
| return new buffer(part, 'binary'); | ||
| })); | ||
| }; | ||
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| module.exports = function createMultipart(doc) { | ||
| doc = utils.clone(doc); | ||
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| var boundary = uuid(); | ||
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| var attachments = {}; | ||
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| // according to npm/npm-fullfat-registry, these need to be sorted | ||
| // or else CouchDB has a fit | ||
| var filenames = Object.keys(doc._attachments).sort(); | ||
| filenames.forEach(function (filename) { | ||
| var att = doc._attachments[filename]; | ||
| if (att.stub) { | ||
| return; | ||
| } | ||
| var binData = base64.atob(att.data); | ||
| attachments[filename] = {type: att.content_type, data: binData}; | ||
| att.length = binData.length; | ||
| att.follows = true; | ||
| delete att.data; | ||
| }); | ||
|
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| var preamble = '--' + boundary + | ||
| '\r\nContent-Type: application/json\r\n\r\n'; | ||
|
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| var origAttachments = doc._attachments; | ||
| doc._attachments = {}; | ||
| var origKeys = Object.keys(origAttachments).sort(); | ||
| origKeys.forEach(function (key) { | ||
| doc._attachments[key] = origAttachments[key]; | ||
| }); | ||
|
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| var docJson = JSON.stringify(doc); | ||
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| var body = new BinaryBuilder() | ||
| .append(preamble) | ||
| .append(docJson); | ||
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| var attsToEncode = Object.keys(attachments).sort(); | ||
| attsToEncode.forEach(function (filename) { | ||
| var att = attachments[filename]; | ||
| var binString = att.data; | ||
| var type = att.type; | ||
| var preamble = '\r\n--' + boundary + | ||
| '\r\nContent-Disposition: attachment; filename=' + | ||
| JSON.stringify(filename) + '' + | ||
| '\r\nContent-Type: ' + type + | ||
| '\r\nContent-Length: ' + binString.length + | ||
| '\r\n\r\n'; | ||
| body.append(preamble).append(utils.fixBinary(binString)); | ||
| }); | ||
|
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| var ending = '\r\n--' + boundary + '--'; | ||
| body.append(ending); | ||
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| var type = 'multipart/related; boundary=' + boundary; | ||
| return { | ||
| headers: { | ||
| 'Content-Type': type | ||
| }, | ||
| body: body.build(type) | ||
| }; | ||
| }; |
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