function $translateSanitizationProvider () {

  'use strict';

  var $sanitize,
      $sce,
      currentStrategy = null, // TODO change to either 'sanitize', 'escape' or ['sanitize', 'escapeParameters'] in 3.0.
      hasConfiguredStrategy = false,
      hasShownNoStrategyConfiguredWarning = false,
      strategies;

  /**
   * Definition of a sanitization strategy function
   * @callback StrategyFunction
   * @param {string|object} value - value to be sanitized (either a string or an interpolated value map)
   * @param {string} mode - either 'text' for a string (translation) or 'params' for the interpolated params
   * @return {string|object}
   */

  /**
   * @ngdoc property
   * @name strategies
   * @propertyOf pascalprecht.translate.$translateSanitizationProvider
   *
   * @description
   * Following strategies are built-in:
   * <dl>
   *   <dt>sanitize</dt>
   *   <dd>Sanitizes HTML in the translation text using $sanitize</dd>
   *   <dt>escape</dt>
   *   <dd>Escapes HTML in the translation</dd>
   *   <dt>sanitizeParameters</dt>
   *   <dd>Sanitizes HTML in the values of the interpolation parameters using $sanitize</dd>
   *   <dt>escapeParameters</dt>
   *   <dd>Escapes HTML in the values of the interpolation parameters</dd>
   *   <dt>escaped</dt>
   *   <dd>Support legacy strategy name 'escaped' for backwards compatibility (will be removed in 3.0)</dd>
   * </dl>
   *
   */

  strategies = {
    sanitize: function (value, mode/*, context*/) {
      if (mode === 'text') {
        value = htmlSanitizeValue(value);
      }
      return value;
    },
    escape: function (value, mode/*, context*/) {
      if (mode === 'text') {
        value = htmlEscapeValue(value);
      }
      return value;
    },
    sanitizeParameters: function (value, mode/*, context*/) {
      if (mode === 'params') {
        value = mapInterpolationParameters(value, htmlSanitizeValue);
      }
      return value;
    },
    escapeParameters: function (value, mode/*, context*/) {
      if (mode === 'params') {
        value = mapInterpolationParameters(value, htmlEscapeValue);
      }
      return value;
    },
    sce: function (value, mode, context) {
      if (mode === 'text') {
        value = htmlTrustValue(value);
      } else if (mode === 'params') {
        if (context !== 'filter') {
          // do html escape in filter context #1101
          value = mapInterpolationParameters(value, htmlEscapeValue);
        }
      }
      return value;
    },
    sceParameters: function (value, mode/*, context*/) {
      if (mode === 'params') {
        value = mapInterpolationParameters(value, htmlTrustValue);
      }
      return value;
    }
  };
  // Support legacy strategy name 'escaped' for backwards compatibility.
  // TODO should be removed in 3.0
  strategies.escaped = strategies.escapeParameters;

  /**
   * @ngdoc function
   * @name pascalprecht.translate.$translateSanitizationProvider#addStrategy
   * @methodOf pascalprecht.translate.$translateSanitizationProvider
   *
   * @description
   * Adds a sanitization strategy to the list of known strategies.
   *
   * @param {string} strategyName - unique key for a strategy
   * @param {StrategyFunction} strategyFunction - strategy function
   * @returns {object} this
   */
  this.addStrategy = function (strategyName, strategyFunction) {
    strategies[strategyName] = strategyFunction;
    return this;
  };

  /**
   * @ngdoc function
   * @name pascalprecht.translate.$translateSanitizationProvider#removeStrategy
   * @methodOf pascalprecht.translate.$translateSanitizationProvider
   *
   * @description
   * Removes a sanitization strategy from the list of known strategies.
   *
   * @param {string} strategyName - unique key for a strategy
   * @returns {object} this
   */
  this.removeStrategy = function (strategyName) {
    delete strategies[strategyName];
    return this;
  };

  /**
   * @ngdoc function
   * @name pascalprecht.translate.$translateSanitizationProvider#useStrategy
   * @methodOf pascalprecht.translate.$translateSanitizationProvider
   *
   * @description
   * Selects a sanitization strategy. When an array is provided the strategies will be executed in order.
   *
   * @param {string|StrategyFunction|array} strategy The sanitization strategy / strategies which should be used. Either a name of an existing strategy, a custom strategy function, or an array consisting of multiple names and / or custom functions.
   * @returns {object} this
   */
  this.useStrategy = function (strategy) {
    hasConfiguredStrategy = true;
    currentStrategy = strategy;
    return this;
  };

  /**
   * @ngdoc object
   * @name pascalprecht.translate.$translateSanitization
   * @requires $injector
   * @requires $log
   *
   * @description
   * Sanitizes interpolation parameters and translated texts.
   *
   */
  this.$get = function ($injector, $log) {

    var cachedStrategyMap = {};

    var applyStrategies = function (value, mode, context, selectedStrategies) {
      angular.forEach(selectedStrategies, function (selectedStrategy) {
        if (angular.isFunction(selectedStrategy)) {
          value = selectedStrategy(value, mode, context);
        } else if (angular.isFunction(strategies[selectedStrategy])) {
          value = strategies[selectedStrategy](value, mode, context);
        } else if (angular.isString(strategies[selectedStrategy])) {
          if (!cachedStrategyMap[strategies[selectedStrategy]]) {
            try {
              cachedStrategyMap[strategies[selectedStrategy]] = $injector.get(strategies[selectedStrategy]);
            } catch (e) {
              cachedStrategyMap[strategies[selectedStrategy]] = function() {};
              throw new Error('pascalprecht.translate.$translateSanitization: Unknown sanitization strategy: \'' + selectedStrategy + '\'');
            }
          }
          value = cachedStrategyMap[strategies[selectedStrategy]](value, mode, context);
        } else {
          throw new Error('pascalprecht.translate.$translateSanitization: Unknown sanitization strategy: \'' + selectedStrategy + '\'');
        }
      });
      return value;
    };

    // TODO: should be removed in 3.0
    var showNoStrategyConfiguredWarning = function () {
      if (!hasConfiguredStrategy && !hasShownNoStrategyConfiguredWarning) {
        $log.warn('pascalprecht.translate.$translateSanitization: No sanitization strategy has been configured. This can have serious security implications. See http://angular-translate.github.io/docs/#/guide/19_security for details.');
        hasShownNoStrategyConfiguredWarning = true;
      }
    };

    if ($injector.has('$sanitize')) {
      $sanitize = $injector.get('$sanitize');
    }
    if ($injector.has('$sce')) {
      $sce = $injector.get('$sce');
    }

    return {
      /**
       * @ngdoc function
       * @name pascalprecht.translate.$translateSanitization#useStrategy
       * @methodOf pascalprecht.translate.$translateSanitization
       *
       * @description
       * Selects a sanitization strategy. When an array is provided the strategies will be executed in order.
       *
       * @param {string|StrategyFunction|array} strategy The sanitization strategy / strategies which should be used. Either a name of an existing strategy, a custom strategy function, or an array consisting of multiple names and / or custom functions.
       */
      useStrategy: (function (self) {
        return function (strategy) {
          self.useStrategy(strategy);
        };
      })(this),

      /**
       * @ngdoc function
       * @name pascalprecht.translate.$translateSanitization#sanitize
       * @methodOf pascalprecht.translate.$translateSanitization
       *
       * @description
       * Sanitizes a value.
       *
       * @param {string|object} value The value which should be sanitized.
       * @param {string} mode The current sanitization mode, either 'params' or 'text'.
       * @param {string|StrategyFunction|array} [strategy] Optional custom strategy which should be used instead of the currently selected strategy.
       * @param {string} [context] The context of this call: filter, service. Default is service
       * @returns {string|object} sanitized value
       */
      sanitize: function (value, mode, strategy, context) {
        if (!currentStrategy) {
          showNoStrategyConfiguredWarning();
        }

        if (!strategy && strategy !== null) {
          strategy = currentStrategy;
        }

        if (!strategy) {
          return value;
        }

        if (!context) {
          context = 'service';
        }

        var selectedStrategies = angular.isArray(strategy) ? strategy : [strategy];
        return applyStrategies(value, mode, context, selectedStrategies);
      }
    };
  };

  var htmlEscapeValue = function (value) {
    var element = angular.element('<div></div>');
    element.text(value); // not chainable, see #1044
    return element.html();
  };

  var htmlSanitizeValue = function (value) {
    if (!$sanitize) {
      throw new Error('pascalprecht.translate.$translateSanitization: Error cannot find $sanitize service. Either include the ngSanitize module (https://docs.angularjs.org/api/ngSanitize) or use a sanitization strategy which does not depend on $sanitize, such as \'escape\'.');
    }
    return $sanitize(value);
  };

  var htmlTrustValue = function (value) {
    if (!$sce) {
      throw new Error('pascalprecht.translate.$translateSanitization: Error cannot find $sce service.');
    }
    return $sce.trustAsHtml(value);
  };

  var mapInterpolationParameters = function (value, iteratee, stack) {
    if (angular.isDate(value)) {
      return value;
    } else if (angular.isObject(value)) {
      var result = angular.isArray(value) ? [] : {};

      if (!stack) {
        stack = [];
      } else {
        if (stack.indexOf(value) > -1) {
          throw new Error('pascalprecht.translate.$translateSanitization: Error cannot interpolate parameter due recursive object');
        }
      }

      stack.push(value);
      angular.forEach(value, function (propertyValue, propertyKey) {

        /* Skipping function properties. */
        if (angular.isFunction(propertyValue)) {
          return;
        }

        result[propertyKey] = mapInterpolationParameters(propertyValue, iteratee, stack);
      });
      stack.splice(-1, 1); // remove last

      return result;
    } else if (angular.isNumber(value)) {
      return value;
    } else if (value === true || value === false) {
      return value;
    } else if (!angular.isUndefined(value) && value !== null) {
      return iteratee(value);
    } else {
      return value;
    }
  };
}
@ngdoc object
@name pascalprecht.translate.$translateSanitizationProvider

@description

Configurations for $translateSanitization