metadata_fetch

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A dart library for extracting metadata in web pages. Supports Open Graph, Meta, Twitter Cards, and Structured Data (Json-LD)

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// repository documentation

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# Metadata Fetch
A dart library for extracting metadata in web pages. Supports OpenGraph, Meta, Twitter Cards, and Structured Data (Json-LD)

Available on Pub Dev:
[Pub](https://pub.dev/packages/metadata_fetch)

## Metadata Structure

```yaml
Metadata:
  - title
  - description
  - image
  - url
```

## Usage

### Extract Metadata for a given URL

```dart
import 'package:metadata_fetch/metadata_fetch.dart';

main() async {
  final myURL = 'https://flutter.dev';

// Use the `MetadataFetch.extract()` function to fetch data from the url
  var data = await MetadataFetch.extract(myURL);

print(data.title) // Flutter - Beautiful native apps in record time

print(data.description) // Flutter is Google's UI toolkit for crafting beautiful...

print(data.image) // https://flutter.dev/images/flutter-logo-sharing.png

print(data.url) // https://flutter.dev/

var dataAsMap = data.toMap();

}
```

### Parsing Manually

#### Get aggregated Metadata from a document

This method prioritizes Open Graph data, followed by Twitter Card, JSON-LD and finally falls back to HTML metadata.

```dart
import 'package:metadata_fetch/metadata_fetch.dart';
import 'package:http/http.dart' as http;

void main () async {

final myURL = 'https://flutter.dev';

// makes a call
  var response = await http.get(myURL);

// Convert Response to a Document. The utility function `MetadataFetch.responseToDocument` is provided or you can use own decoder/parser.
  var document = MetadataFetch.responseToDocument(response);

// get aggregated metadata
  var data = MetadataParser.parse(document);
  print(data);

}

```

#### Manually specify which Metadata parser to use

```dart
import 'package:metadata_fetch/metadata_fetch.dart';
import 'package:http/http.dart' as http;

void main () async {

final myURL = 'https://flutter.dev';

// Makes a call
  var response = await http.get(myURL);

// Convert Response to a Document. The utility function `responseToDocument` is provided or you can use own decoder/parser.
  var document = responseToDocument(response);

// Get OpenGraph Metadata
  var ogData = MetadataParser.OpenGraph(document);
  print(ogData);

// Get Html metadata
  var htmlData = MetadataParser.HtmlMeta(document);
  print(htmlData);

// Get Structured Data
  var structuredData = MetadataParser.JsonLdSchema(document);
  print(structuredData);

// Get Twitter Cards Data
  var  twitterCardData = MetadataParser.TwitterCard(document);
  print(twitterCardData);

}
```

#### Provide a fallback url when manually parsing

If the parsers cannot extract a URL from the document, you may optionally provide a URL in `MetadataFetch.parse()`.

This URL will be added in the final `Metadata` structure, and is used to resolve images with relative URLs (non-absolute URLs).

```dart
import 'package:metadata_fetch/metadata_fetch.dart';
import 'package:http/http.dart' as http;

void main () async {

final myURL = 'https://flutter.dev';

// makes a call
  var response = await http.get(myURL);

// Convert Response to a Document. The utility function `MetadataFetch.responseToDocument` is provided or you can use own decoder/parser.
  var document = MetadataFetch.responseToDocument(response);

// get aggregated metadata, supplying a fallback URL
  // Used for images with relative URLs
  var data = MetadataParser.parse(document, url:myURL);
  print(data);

}

```

## Credit
This library is inspired by [open_graph_parser](https://github.com/Patte1808/open_graph_parser). 
However this one tries to be more general.

## Roadmap
- Weighted or Preferred Metadata. Can assign custom weights for each parser to provide a fallback priority sytem
- Improve Documentation

## Questions, Bugs, and Feature Requests
Please forward all queries about this project to the [issue tracker](https://github.com/jg-l/metadata_fetch/issues).

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