ErrorBoundary: display error text, fixes #672

app/soapbox/components/error_boundary.js

@@ -10,18 +10,35 @@ export default class ErrorBoundary extends React.PureComponent {
 
   state = {
     hasError: false,
-    stackTrace: undefined,
     componentStack: undefined,
   }
 
   componentDidCatch(error, info) {
     this.setState({
       hasError: true,
-      stackTrace: error.stack,
+      error,
       componentStack: info && info.componentStack,
     });
   }
 
+  setTextareaRef = c => {
+    this.textarea = c;
+  }
+
+  handleCopy = e => {
+    if (!this.textarea) return;
+
+    this.textarea.select();
+    this.textarea.setSelectionRange(0, 99999);
+
+    document.execCommand('copy');
+  }
+
+  getErrorText = () => {
+    const { error, componentStack } = this.state;
+    return error + componentStack;
+  }
+
   clearCookies = e => {
     localStorage.clear();
     sessionStorage.clear();
@@ -34,6 +51,8 @@ export default class ErrorBoundary extends React.PureComponent {
       return this.props.children;
     }
 
+    const errorText = this.getErrorText();
+
     return (
       <div className='error-boundary'>
         <div>
@@ -43,6 +62,13 @@ export default class ErrorBoundary extends React.PureComponent {
             <i className='fa fa-reply' aria-hidden='true' />&nbsp;
             <FormattedMessage id='alert.unexpected.return_home' defaultMessage='Return Home' />
           </a>
+          {errorText && <textarea
+            ref={this.setTextareaRef}
+            className='error-boundary__component-stack'
+            value={errorText}
+            onClick={this.handleCopy}
+            readOnly
+          />}
           <p className='help-text'>
             <FormattedMessage
               id='alert.unexpected.help_text'

app/styles/components/error-boundary.scss

@@ -9,7 +9,7 @@
     display: block;
     text-align: center;
     font-size: 70px;
-    margin-bottom: 20px;
+    margin: 20px 0;
     opacity: 0.5;
   }
 
@@ -38,8 +38,16 @@
     font-style: italic;
     font-size: 14px;
     padding: 20px 10px 0;
-    margin-top: 70px;
+    margin-top: 20px;
     opacity: 0.7;
     border-top: 1px solid;
   }
+
+  &__component-stack {
+    width: 100%;
+    height: 200px;
+    text-align: left;
+    margin: 20px 0;
+    padding: 10px;
+  }
 }