Function getTrusted

test/angular/1.6/angular.js:19702–19731

* @ngdoc method * @name $sceDelegate#getTrusted * * @description * Takes any input, and either returns a value that's safe to use in the specified context, or * throws an exception. * * In practice, there are several cases. When given a string, this function runs c

(type, maybeTrusted)

     *     exception if this is impossible.
     */
    function getTrusted(type, maybeTrusted) {
      if (maybeTrusted === null || isUndefined(maybeTrusted) || maybeTrusted === '') {
        return maybeTrusted;
      }
      var constructor = (byType.hasOwnProperty(type) ? byType[type] : null);
      // If maybeTrusted is a trusted class instance or subclass instance, then unwrap and return
      // as-is.
      if (constructor && maybeTrusted instanceof constructor) {
        return maybeTrusted.$$unwrapTrustedValue();
      }
      // Otherwise, if we get here, then we may either make it safe, or throw an exception. This
      // depends on the context: some are sanitizatible (HTML), some use whitelists (RESOURCE_URL),
      // some are impossible to do (JS). This step isn't implemented for CSS and URL, as AngularJS
      // has no corresponding sinks.
      if (type === SCE_CONTEXTS.RESOURCE_URL) {
        // RESOURCE_URL uses a whitelist.
        if (isResourceUrlAllowedByPolicy(maybeTrusted)) {
          return maybeTrusted;
        } else {
          throw $sceMinErr('insecurl',
              'Blocked loading resource from url not allowed by $sceDelegate policy.  URL: {0}',
              maybeTrusted.toString());
        }
      } else if (type === SCE_CONTEXTS.HTML) {
        // htmlSanitizer throws its own error when no sanitizer is available.
        return htmlSanitizer(maybeTrusted);
      }
      // Default error when the $sce service has no way to make the input safe.
      throw $sceMinErr('unsafe', 'Attempting to use an unsafe value in a safe context.');
    }

    return { trustAs: trustAs,
             getTrusted: getTrusted,