Github user TimBarham commented on a diff in the pull request: https://github.com/apache/cordova-lib/pull/363#discussion_r54727968 --- Diff: cordova-lib/src/cordova/plugin.js --- @@ -512,3 +543,219 @@ function versionString(version) { return null; } + +/** + * Gets the version of a plugin that should be fetched for a given project based + * on the plugin's engine information from NPM and the platforms/plugins installed + * in the project. The cordovaDependencies object in the package.json's engines + * entry takes the form of an object that maps plugin versions to a series of + * constraints and semver ranges. For example: + * + * { plugin-version: { constraint: semver-range, ...}, ...} + * + * Constraint can be a plugin, platform, or cordova version. Plugin-version + * can be either a single version (e.g. 3.0.0) or an upper bound (e.g. <3.0.0) + * + * @param {string} projectRoot The path to the root directory of the project + * @param {object} pluginInfo The NPM info of the plugin be fetched (e.g. the + * result of calling `registry.info()`) + * @param {string} cordovaVersion The semver version of cordova-lib + * + * @return {Promise} A promise that will resolve to either a string + * if there is a version of the plugin that this + * project satisfies or null if there is not + */ +function getFetchVersion(projectRoot, pluginInfo, cordovaVersion) { + // Figure out the project requirements + if (pluginInfo.engines && pluginInfo.engines.cordovaDependencies) { + var pluginList = getInstalledPlugins(projectRoot); + var pluginMap = {}; + + pluginList.forEach(function(plugin) { + pluginMap[plugin.id] = plugin.version; + }); + + return cordova_util.getInstalledPlatformsWithVersions(projectRoot) + .then(function(platformVersions) { + return determinePluginVersionToFetch( + pluginInfo.versions, + pluginInfo.engines.cordovaDependencies, + pluginMap, + platformVersions, + cordovaVersion); + }); + } else { + // If we have no engine, we want to fall back to the default behavior + events.emit('verbose', 'No plugin engine info found or not using registry, falling back to latest or pinned version'); + return Q(null); + } +} + +function findVersion(versions, version) { + var cleanedVersion = semver.clean(version); + for(var i = 0; i < versions.length; i++) { + if(semver.clean(versions[i]) === cleanedVersion) { + return versions[i]; + } + } + return null; +} + +/* + * The engine entry maps plugin versions to constraints like so: + * { + * '1.0.0' : { 'cordova': '<5.0.0' }, + * '<2.0.0': { + * 'cordova': '>=5.0.0', + * 'cordova-ios': '~5.0.0', + * 'cordova-plugin-camera': '~5.0.0' + * }, + * '3.0.0' : { 'cordova-ios': '>5.0.0' } + * } + * + * See cordova-spec/plugin_fetch.spec.js for test cases and examples + */ +function determinePluginVersionToFetch(allVersions, engine, pluginMap, platformMap, cordovaVersion) { + // Filters out pre-release versions + var latest = semver.maxSatisfying(allVersions, '>=0.0.0'); + + var versions = []; + var upperBound = null; + var upperBoundRange = null; + + for(var version in engine) { + if(semver.valid(semver.clean(version)) && !semver.gt(version, latest)) { + versions.push(version); + } else { + // Check if this is an upperbound; validRange() handles whitespace + var cleanedRange = semver.validRange(version); + if(cleanedRange && UPPER_BOUND_REGEX.exec(cleanedRange)) { + // We only care about the highest upper bound that our project does not support + if(getFailedRequirements(engine[version], pluginMap, platformMap, cordovaVersion).length !== 0) { + var maxMatchingUpperBound = cleanedRange.substring(1); + if (maxMatchingUpperBound && (!upperBound || semver.gt(maxMatchingUpperBound, upperBound))) { + upperBound = maxMatchingUpperBound; + upperBoundRange = version; + } + } + } --- End diff -- It would be useful to output a message (with log level `verbose`) if we are ignoring an entry because it either isn't a valid version or range, or is a valid range (according to semver), but something other than an "upper bound". This would be helpful particularly for plugin authors debugging their `engines` entries :smile:.
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