Move sharing to special endpoint.

This makes a couple of assumptions about the shape of the endpoint:
- Route is /proxy/projects/:id/share.
- Returns the full (updated) project info on success, just like the project update endpoint does.

I reviewed these with colby since this is frontrunning the actual API, but I can update once the API is finalized.

src/redux/preview.js

@@ -770,6 +770,25 @@ module.exports.restoreComment = (projectId, commentId, topLevelCommentId, token)
     });
 });
 
+module.exports.shareProject = (projectId, token) => (dispatch => {
+    dispatch(module.exports.setFetchStatus('project', module.exports.Status.FETCHING));
+    api({
+        uri: `/proxy/projects/${projectId}/share`,
+        authentication: token,
+        withCredentials: true,
+        method: 'PUT',
+        useCsrf: true
+    }, (err, body, res) => {
+        if (err || res.statusCode !== 200) {
+            dispatch(module.exports.setFetchStatus('project', module.exports.Status.ERROR));
+            dispatch(module.exports.setError(err));
+            return;
+        }
+        dispatch(module.exports.setFetchStatus('project', module.exports.Status.FETCHED));
+        dispatch(module.exports.setProjectInfo(body));
+    });
+});
+
 module.exports.reportProject = (id, jsonData, token) => (dispatch => {
     dispatch(module.exports.setFetchStatus('report', module.exports.Status.FETCHING));
     // scratchr2 will fail if no thumbnail base64 string provided. We don't yet have

src/views/preview/preview.jsx

@@ -328,10 +328,8 @@ class Preview extends React.Component {
         this.props.setPlayer(false);
     }
     handleShare () {
-        this.props.updateProject(
+        this.props.shareProject(
             this.props.projectInfo.id,
-            {isPublished: true},
-            this.props.user.username,
             this.props.user.token
         );
     }
@@ -542,6 +540,7 @@ Preview.propTypes = {
     setFullScreen: PropTypes.func.isRequired,
     setLovedStatus: PropTypes.func.isRequired,
     setPlayer: PropTypes.func.isRequired,
+    shareProject: PropTypes.func.isRequired,
     toggleStudio: PropTypes.func.isRequired,
     updateProject: PropTypes.func.isRequired,
     user: PropTypes.shape({
@@ -694,6 +693,9 @@ const mapDispatchToProps = dispatch => ({
     setLovedStatus: (loved, id, username, token) => {
         dispatch(previewActions.setLovedStatus(loved, id, username, token));
     },
+    shareProject: (id, token) => {
+        dispatch(previewActions.shareProject(id, token));
+    },
     reportProject: (id, formData, token) => {
         dispatch(previewActions.reportProject(id, formData, token));
     },