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Post.js doesn't escape data with double quote characters #4142

smroe opened this issue Feb 21, 2020 · 2 comments

Post.js doesn't escape data with double quote characters #4142

smroe opened this issue Feb 21, 2020 · 2 comments


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@smroe smroe commented Feb 21, 2020

Expected behaviour

Import of xml2js file (created from Joomla site) to create a set of .md files representing the origin Joomla site.

Actual behavior

YAML processing exception thrown:
YAMLException: can not read a block mapping entry; a multiline key may not be an implicit key at line 2, column 5:
date: 2011-11-14 14:38:13
at generateError (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:167:10)
at throwError (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:173:9)
at readBlockMapping (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:1073:9)
at composeNode (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:1359:12)
at readDocument (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:1519:3)
at loadDocuments (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:1575:5)
at load (<>\import\node_modules\js-yaml\lib\js-yaml\loader.js:1596:19)
at _getScaffold.then.then.frontMatter (<>\import\node_modules\hexo\lib\hexo\post.js:149:63)
at tryCatcher (<>\import\node_modules\bluebird\js\release\util.js:16:23)
at Promise._settlePromiseFromHandler (<>\import\node_modules\bluebird\js\release\promise.js:547:31)
at Promise._settlePromise (<>\import\node_modules\bluebird\js\release\promise.js:604:18)

Possible Solution

I have traced this and think that the problem is in post.js @ PostRenderCache.prepareFrontMatter. The current string case assumes that the item variable doesn't include any double quotation marks. If it does, then the resulting data[key] value has an incorrect format.

I don't know if this will impact elsewhere, but I think that the last case needs to be modified to:

for (const key of Object.keys(data)) {
    const item = data[key];

    if (moment.isMoment(item)) {
      data[key] = item.utc().format('YYYY-MM-DD HH:mm:ss');
    } else if (moment.isDate(item)) {
      data[key] = moment.utc(item).format('YYYY-MM-DD HH:mm:ss');
    } else if (typeof item === 'string') {
      data[key] = `"` + item.replace( /"/g, '\\"')  + `"`;

  return data;

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@SukkaW SukkaW commented Feb 21, 2020

Would you mind providing me about the exact front-matter of your markdown file?


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@smroe smroe commented Feb 21, 2020

The problem occurs when using the Joomla migrator, so you need to use an xml2js file. Mine is 100+Meg in size, so I have distilled it into a single article (at a much more friendly 2k).

Migrating the attachment, via:

hexo migrate joomla input.xml

results in the exception. Escaping the " characters in the title (via the above adjustment) sorts the problem.

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