1 files changed, 44 insertions, 0 deletions
diff --git a/app/assets/javascripts/content_editor/services/upload_file.js b/app/assets/javascripts/content_editor/services/upload_file.js
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+++ b/app/assets/javascripts/content_editor/services/upload_file.js
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+import axios from '~/lib/utils/axios_utils';
+
+const extractAttachmentLinkUrl = (html) => {
+  const parser = new DOMParser();
+  const { body } = parser.parseFromString(html, 'text/html');
+  const link = body.querySelector('a');
+  const src = link.getAttribute('href');
+  const { canonicalSrc } = link.dataset;
+
+  return { src, canonicalSrc };
+};
+
+/**
+ * Uploads a file with a post request to the URL indicated
+ * in the uploadsPath parameter. The expected response of the
+ * uploads service is a JSON object that contains, at least, a
+ * link property. The link property should contain markdown link
+ * definition (i.e. [GitLab](https://gitlab.com)).
+ *
+ * This Markdown will be rendered to extract its canonical and full
+ * URLs using GitLab Flavored Markdown renderer in the backend.
+ *
+ * @param {Object} params
+ * @param {String} params.uploadsPath An absolute URL that points to a service
+ * that allows sending a file for uploading via POST request.
+ * @param {String} params.renderMarkdown A function that accepts a markdown string
+ * and returns a rendered version in HTML format.
+ * @param {File} params.file The file to upload
+ *
+ * @returns Returns an object with two properties:
+ *
+ * canonicalSrc: The URL as defined in the Markdown
+ * src: The absolute URL that points to the resource in the server
+ */
+export const uploadFile = async ({ uploadsPath, renderMarkdown, file }) => {
+  const formData = new FormData();
+  formData.append('file', file, file.name);
+
+  const { data } = await axios.post(uploadsPath, formData);
+  const { markdown } = data.link;
+  const rendered = await renderMarkdown(markdown);
+
+  return extractAttachmentLinkUrl(rendered);
+};