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254 lines (228 loc) · 8.55 KB
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/**
* @file validate.js
* @description This file contains the code to validate the VTT data.
*/
import DOMPurify from 'dompurify';
/** PRE-SANITIZED FUNCTIONS
* Some of the VTT attributes need to be transformed before being sanitized by DOMPurify.
* @namespace preProcessing
*/
var preProcessing = {
/**
* Transforms tags with class names separated by dots into tags with a class attribute containing space-separated class names.
* @memberof preProcessing
* @param {string} vttContent - The content of the VTT.
* @returns {string} - The VTT content with processed tags.
*/
transformCSSClasses: function (vttContent) {
// This function should only be passed one cue at a time.
// Throw an error if the string checked is more than 1000 characters.
if ( vttContent.length > 1000 ) {
throw new Error( "Input too long" );
}
return vttContent.replace(
/<(v|c|b|i|u|lang|ruby)\.([\w.]+)([^>]*)>/g,
function (_, tag, cssClasses, otherAttrs) {
var classAttr = cssClasses.replace(/\./g, " ");
return `<${tag} class="${classAttr}"${otherAttrs}>`;
}
);
},
/**
* Transforms <lang> tags by adding a lang attribute with the language code.
* @memberof preProcessing
* @param {string} content - The content with processed CSS classes.
* @returns {string} - The content with <lang> tags transformed.
*/
transformLangTags: function (content) {
return content.replace(
/<lang\s+([\w-]+)([^>]*)>/g,
function (_, langCode, otherAttrs) {
return '<lang lang="' + langCode + '"' + otherAttrs + ">";
}
);
},
/**
* Transforms <v> tags by extracting any non-attribute text as a `title` attribute,
* retains existing attributes (except class), and preserves the class attribute if present.
* Example: <v John class="foo" data-x="y"> becomes <v title="John" data-x="y" class="foo">
*
* @function
* @memberof preProcessing
* @param {string} content - The string content containing <v> tags to process.
* @returns {string} The content with <v> tags transformed to include a title attribute and preserved attributes.
*/
transformVTags: function (content) {
return content.replace(/<v\s+([^>]*?)>/g, function (_, tagAttributes) {
var classMatch = tagAttributes.match(/class="([^"]*)"/);
var titleMatch = tagAttributes.match(/title="([^"]*)"/);
var classAttr = classMatch ? classMatch[0] : "";
var titleAttr = titleMatch ? titleMatch[0] : "";
var otherAttributes = tagAttributes
.replace(/class="[^"]*"/, "")
.replace(/title="[^"]*"/, "")
.trim()
.split(/\s+/);
var attributes = [];
var titleParts = [];
// Iterate over each token of the tag content
otherAttributes.forEach(function (token) {
if (token.indexOf("=") !== -1) {
attributes.push(token);
} else {
titleParts.push(token);
}
});
var title = ( titleParts ) ? titleParts.join(" ") : false;
var newTag = "<v";
if ( title && ! titleAttr ) {
newTag += ' title="' + title + '"';
}
if ( titleAttr && ! title ) {
newTag += " " + titleAttr;
}
if (attributes.length > 0) {
newTag += " " + attributes.join(" ");
}
if (classAttr) {
newTag += " " + classAttr;
}
newTag += ">";
return newTag;
});
},
};
/** POST-SANITIZED FUNCTIONS
* After sanitizing the VTT data, some tags need to be transformed back to their original form.
* @namespace postProcessing
*/
var postProcessing = {
/**
* Post-processes <c> tags by converting class attributes to dot-separated class names.
* @memberof postProcessing
* @param {string} vttContent - The VTT content to be processed.
* @returns {string} - The VTT content with processed <c> tags.
*/
postprocessCTag: function (vttContent) {
return vttContent.replace(
/<c class="([\w\s]+)">/g,
function (_, classNames) {
var classes = classNames.replace(/ /g, ".");
return "<c." + classes + ">";
}
);
},
/**
* * Post-processes <v> tags by converting class attributes, no matter where found in the attribute order, to dot-separated class names.
* For example, <v class="foo bar" title="John"> becomes <v.foo.bar title="John">.
* Removes the class attribute and appends other attributes after the class names.
*
* @function
* @memberof postProcessing
* @param {string} vttContent - The VTT content to be processed.
* @returns {string} - The VTT content with processed <v> tags.
*/
postprocessVTag: function (vttContent) {
return vttContent.replace(
/<v([^>]*)class="([\w\s]+)"([^>]*)>/g,
function (_, beforeClass, classNames, afterClass) {
var classes = classNames.trim().split(/\s+/).join(".");
// Rebuild the tag: <v.{classes}{other attributes}>
// Remove class="..." from attributes
var attrs = (beforeClass + afterClass)
.replace(/\s*class="[\w\s]+"/, "")
.trim();
return "<v." + classes + (attrs ? " " + attrs : "") + ">";
}
);
},
/**
* Post-processes <lang> tags by removing the lang attribute and placing the language code directly in the tag.
* @memberof postProcessing
* @param {string} vttContent - The VTT content to be processed.
* @returns {string} - The VTT content with processed <lang> tags.
*/
postprocessLangTag: function (vttContent) {
return vttContent.replace(
/<lang lang="([\w-]+)"([^>]*)>/g,
function (_, langCode, otherAttrs) {
return "<lang " + langCode + otherAttrs + ">";
}
);
},
};
/**
* Preprocesses, sanitizes and post-processes VTT content as well as other utility functions.
* @namespace validate
*/
var validate = {
/**
* Sets up the VTT content before sanitizing by transforming tags.
* This way DOM purify will process the tags correctly.
* @memberof validate
* @param {string} vttContent - The original content of the VTT.
* @returns {string} - The VTT content for the next and final step of preprocessing.
*/
preProcessVttContent: function (vttContent) {
var processedCSS = preProcessing.transformCSSClasses(vttContent);
var processedLang = preProcessing.transformLangTags(processedCSS);
var processedVTags = preProcessing.transformVTags(processedLang);
return processedVTags;
},
/**
* Post-processes the sanitized VTT data by converting class attributes to dot-separated class names and other transformations.
* @memberof validate
* @param {string} sanitizedVttContent - The sanitized VTT content to be post-processed.
* @param {string} originalVttContent - The original VTT content before sanitization.
* @returns {string} - The post-processed VTT content.
*/
postProcessVttContent: function (sanitizedVttContent, originalVttContent) {
var processedCTags = postProcessing.postprocessCTag(sanitizedVttContent);
var processedVTags = postProcessing.postprocessVTag(processedCTags);
var processedLangTags = postProcessing.postprocessLangTag(processedVTags);
var arrowReplaced = processedLangTags.replace(/-->/g, "-->");
var timestampTagReplaced = arrowReplaced.replace(/<([\d:.]+)>/g, '<$1>');
var finalContent = timestampTagReplaced.replace(
/<\/v>/g,
function (match, offset) {
return originalVttContent.indexOf(match, offset) !== -1 ? match : "";
}
);
return finalContent;
},
/**
* Sanitizes the VTT data by removing unwanted tags and attributes, and then post-processes it.
* @memberof validate
* @param {string} vttContent - The VTT content to be sanitized and post-processed.
* @returns {string} - The fully processed VTT content.
*/
sanitizeVttContent: function (vttContent) {
if (vttContent === null || vttContent === undefined) {
return "";
}
var preSanitizedVttContent = validate.preProcessVttContent(vttContent);
var config = {
ALLOWED_TAGS: ["b", "i", "u", "v", "c", "lang", "ruby", "rt", "rp"],
ALLOWED_ATTR: ["title", "class", "lang"],
KEEP_CONTENT: true,
};
var sanitizedVttContent = DOMPurify.sanitize(
preSanitizedVttContent,
config
);
return validate.postProcessVttContent(sanitizedVttContent, vttContent);
},
// Utility validation functions
isProtocolSafe: function (url) {
//creates a new URL object for analysis to check if the protocol is http or https
//returns true if there is a match false otherwise
try {
const parsedUrl = new URL(url, window.location.origin); // Resolve relative URLs
return ["http:", "https:"].includes(parsedUrl.protocol); // Allow only HTTP and HTTPS
} catch (e) {
return false; // Invalid URL
}
},
};
// End of validate.js
export default validate;
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