'use strict';
var md5 = require('../deps/md5');
var collate = require('pouchdb-collate').collate;
function sortObjectPropertiesByKey(queryParams) {
return Object.keys(queryParams).sort(collate).reduce(function (result, key) {
result[key] = queryParams[key];
return result;
}, {});
}
// Generate a unique id particular to this replication.
// Not guaranteed to align perfectly with CouchDB's rep ids.
function generateReplicationId(src, target, opts) {
var docIds = opts.doc_ids ? opts.doc_ids.sort(collate) : '';
var filterFun = opts.filter ? opts.filter.toString() : '';
var queryParams = '';
var filterViewName = '';
if (opts.filter && opts.query_params) {
queryParams = JSON.stringify(sortObjectPropertiesByKey(opts.query_params));
}
if (opts.filter && opts.filter === '_view') {
filterViewName = opts.view.toString();
}
return src.id().then(function (src_id) {
return target.id().then(function (target_id) {
var queryData = src_id + target_id + filterFun + filterViewName +
queryParams + docIds;
return md5(queryData).then(function (md5sum) {
// can't use straight-up md5 alphabet, because
// the char '/' is interpreted as being for attachments,
// and + is also not url-safe
md5sum = md5sum.replace(/\//g, '.').replace(/\+/g, '_');
return '_local/' + md5sum;
});
});
});
}
module.exports = generateReplicationId;
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