I have an URL for the site but not for it's feed(s), which I want to parse.
How to
detect if site has an RSS/Atom feed(s)?
Look for the rel="alternate" type="application/rss+xml" link in the head section of the site's defalut page:
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="http://someurl/feed/" />
<title>Some title</title>
</head>
As mentioned in this question How to check if a site has rss feeds
you need to download the page and check for a rel='alternate'.
You could also have a fallback to regex the page for any mention of a feed.xml or similar, should the first parse fail, if you want to be sure to find any possible link to a RSS/Atom. This would not be as certain to contain the RSS of the actual page, it could be a link to an outside RSS.
Related
I am currently working on facebook sharing and it seems there aren't many topics on facebook sharing with C#. Trying to learn something...
I have Open Graph meta tags in one of razor views like below:
<head>
<meta name="viewport" content="width=device-width" />
<title>Hello World!</title>
<meta property="fb:app_id" content="************" />
<meta property="og:site_name" content="www.hello-world.com" />
<meta property="og:type" content="website" />
<meta property="og:url" content="http://hello-world.com/home/fbshare" />
<meta property="og:title" content="How are you doing today?" />
<meta property="og:description" content="Great to know you are doing fine." />
<meta name="author" content="Hello" />
<meta property="og:image" content="https://images.pexels.com/photos/2324/skyline-buildings-new-york-skyscrapers.jpg?w=940&h=650&auto=compress&cs=tinysrgb" />
<meta property="og:image:type" content="image/jpeg" />
<meta property="og:image:width" content="800" />
<meta property="og:image:height" content="420" />
</head>
For normal users I'd like to redirect them to somewhere else from this view like below:
#{Response.Redirect("Somewhere in my application")};
But I do not want to redirect the facebook scraper too. Is there anyway I can identify the facebook or facebook scraper user agent and If I found out that this is facebook user agent do not redirect him anywhere else redirect them from the view to somewhere else.
P.S: According to facebook official documentation I have to find facebook user agent and allow them scrape my Open Graph meta tags but I can't dig a way.
The Facebook crawler needs to be able to access your content in order
to scrape and share it correctly. Your pages should be visible to the
crawler. If you require login or otherwise restrict access to your
content, you'll need to whitelist our crawler. You should also exempt
it from DDoS protection mechanisms.
If content isn't available at the time of scraping, you can force a
rescrape once it becomes available by passing the URL through the
Sharing Debugger.
The Facebook crawler can be identified by either of these user agent strings:
facebookexternalhit/1.1
(+http://www.facebook.com/externalhit_uatext.php)
OR
facebookexternalhit/1.1
Have you tried:
var userAgent = HttpContext.Request.Headers["User-Agent"];
if (userAgent != null &&
userAgent.Contains("facebookexternalhit/"))
{
// Is a Facebook agent
}
else
{
// Is not a Facebook agent
}
Of course, in MVC you should never redirect from a view, only redirect from a controller or a filter.
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="#nytimes">
<meta name="twitter:creator" content="#SarahMaslinNir">
<meta name="twitter:title" content="Parade of Fans for Houston’s Funeral">
<meta name="twitter:description" content="NEWARK - Thenter code heree guest list and parade of limousines with celebrities emerging from them seemed more suited ">
<meta name="twitter:image" content="http://graphics8.nytimes.com/images/2012/02/19/us/19whitney-span/19whitney-span-articleLarge.jpg">
I have used all the above meta tags, but still the image appears only as a summary card rather than displaying a summary card with large image.
I've been testing your code on a test page, html only. Everything worked fine for me. Here is also the Tweet generated with only the meta tags inside.
Looks to me more, there are other problems inside the html that might cause wrong interpretation of your meta tags.
I need to share images from web links with text to Twitter and LinkedIn.
I am able to add text, but I am not able to add images.
I am using Kentico CMS and I have written the web part transformation as below. But the image is not shown on the Twitter and LinkedIn plugins.
Attached here with the transformation below.
Added the Twitter and LinkedIn result without images.
Can any one guide me with sharing to Twitter and LinkedIn feeds with images?
Thanks
<a class="fb-xfbml-parse-ignore" target="_blank"
href="https://twitter.com/intent/tweet?url=<%=Server.UrlEncode(CMS.DocumentEngine.DocumentContext.CurrentDocument.AbsoluteURL)%>
&picture=<%#GetAbsoluteUrl(CMS.DocumentEngine.DocumentContext.CurrentDocument.GetValue("StoryImageURL").ToString())%>
&text=<%#CMS.DocumentEngine.DocumentContext.CurrentDocument.GetValue("Title").ToString()%>"
onClick="return popup(this, 'notes')">
<img src="<%# Eval("twittericon") %>" alt="twitter icon" />
</a>
<a class="fb-xfbml-parse-ignore" target="_blank" href="https://www.linkedin.com/shareArticle?url=<%=CMS.DocumentEngine.DocumentContext.CurrentDocument.AbsoluteURL%>
&picture=<%#GetAbsoluteUrl(CMS.DocumentEngine.DocumentContext.CurrentDocument.GetValue("StoryImageURL").ToString()) %> <%#CMS.DocumentEngine.DocumentContext.CurrentDocument.GetValue("BlogDescription").ToString()%>" onClick="return popup(this, 'notes')">
<img src="<%# Eval("linkedicon") %>" alt="linked icon" />
</a>
First of all, I do not think Twitter and LinkedIn expose a way of sharing an image alongside the text just by adding a parameter to the share URL.
For Twitter, you could set up Cards, such as a Summary Card, and add meta tags to your website. By adding a twitter:image meta tag, you can tell Twitter which image to use.
Similar applies to LinkedIn - you would need to use Open Graph meta tags, as there is no way to provide an image as part of the share URL.
Regarding the transformation you wrote - make sure you are rendering the correct data, as using CMS.DocumentEngine.DocumentContext.CurrentDocument inside a transformation would retrieve data from the current document that is being viewed, as opposed to data of the repeated item. For rendering data of the repeated item, you can use the Eval method.
This:
<%#CMS.DocumentEngine.DocumentContext.CurrentDocument.GetValue("Title").ToString()%>
Would become this:
<%#Eval("Title")%>
For all my sites I use a Head HTML Code webpart on the page template of the pages I want or need to have this Open Graph (OG) data on. Here's a sample of what I put in it to dynamically populate some of the data.
<meta property="og:site_name" content="Kehren Development - Kentico MVP & Experts" />
<meta property="og:url" content="{% CurrentDocument.AbsoluteURL #%}" />
<meta property="og:image" content="{%RootDocument.AbsoluteURL#%}KehrenDev/media/images/logos/twitter-logo-800.jpg" />
<meta property="og:type" content="article" />
<meta property="og:title" content="{% BlogPostTitle %}" />
<meta property="og:description" content="{% StripTags(BlogPostSummary) %}" />
<meta property="article:publisher" content="https://www.facebook.com/bkehren" />
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="{% BlogPostTitle %}">
<meta name="twitter:site" content="#kehrendev">
<meta name="twitter:creator" content="#bkehren">
<meta name="twitter:description" content="{% StripTags(BlogPostSummary) %}">
<meta name="twitter:url" content="{% CurrentDocument.AbsoluteURL #%}">
<meta name="twitter:image" content="{%RootDocument.AbsoluteURL#%}KehrenDev/media/images/logos/twitter-logo-800.jpg">
<meta name="twitter:domain" content="{%RootDocument.AbsoluteURL#%}">
This will be rendered on the page anytime a blog post is viewed. You can set these properties on the webpart to only display for those page types. There are other meta tags you can use or different fields you can set but this will get you started.
Now you can still use the share links you have but only populate the share link with the actual article link and maybe an encoded description, the OG tags will pickup the rest.
I'm working on a site whose front end is in angularjs and backend in ROR , Same ROR API is used in an android app also . Now I have a situation here . I need to share my Web's post on the Social media like facebook , twitter and google plus . And along with the link to the single post there should be a small preview also (a preview of the post which crawls before posting e.g in facebook) .I did it using angular Plugins . But when it comes to Android side , what they share and what displays on Facebook is the Link only . Then i did some R&D and i came to know that it must be done on server side with social media meta tags . I did a little bit but it still no works . I'm stuck on it . Below is what i've done so far .
def show
#post = Post.find_by_permalink(params[:id])
respond_to do |format|
format.html
format.js
end
end
In My views posts/show.html.erb
<!DOCTYPE html>
<html>
<head>
<title> Shared Question</title>
<meta property="og:title" content="My Page" />
<meta property="og:description" content="A description of my page." />
<meta property="og:image" content="http://www.example.com/images/my_lovely_face.jpg" />
<!-- etc. -->
</head>
<body>
Here is the body
</body>
</html>
I just need to show a small preview whenever some user share my web post's link on any media
You are correct, you need to implement special open graph (and other) tags for the customized social sharing functionalities.
Keep in mind that e.g. facebook will cache your page.
So you may try https://developers.facebook.com/tools/debug/ to test your code without caching - the code itself looks fine.
Example Code:
Place this code between <head> and </head> with your other meta tags.
<meta property="og:title" content="Title">
<meta property="og:site_name" content="Name">
<meta property="og:url" content="URL">
<meta property="og:description" content="Description Text">
<meta property="og:type" content="article">
<!--- network Specific -->
<meta property="fb:app_id" content="AppID">
<meta name="twitter:card" content="app">
<meta name="twitter:site" content="#FernerJohannes">
If you want to target Twitter specifically here are their card-guidelines:
https://dev.twitter.com/cards/getting-started
You may also want to checkout: Open Graph validation for HTML5
You can set a custom image for you website to be shown in fb posts -
Add the OG XML to your html tag
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:fb="http://ogp.me/ns/fb#">
Add these meta tags to set the custom image that OG will use
<meta property="og:image" content="url_to_image" />
You can try reading this for more insight.
Hopefully this helps.
Looking to set up a Twitter product card integrated through Shopify -- while the product info is populating in the validator preview and the got confirmation that the card was approved, there is no next step available. The help article that shopify provided instructs to use "catalog view" as next step however I haven't been able to access. Any insights?
https://docs.shopify.com/manual/configuration/store-customization/social-media/twitter/taking-advantage-of-twitter-cards
EDIT: If you're already able to view the proper card in the validator tool, then all that's left is to tweet out a link and see if it works!
--
It looks like Twitter has changed their Card Application & Validation pages since that Shopify article was written.
According to https://dev.twitter.com/cards/types/product, just copy and paste this code into your twitter-card snippet, and update it with your information.
<meta name="twitter:card" content="product">
<meta name="twitter:site" content="#iHeartRadio">
<meta name="twitter:creator" content="#iHeartRadio">
<meta name="twitter:domain" content="iheart.com">
<meta name="twitter:title" content="24/7 Beatles — Celebrating 50 years of Beatlemania">
<meta name="twitter:image" content="http://radioedit.iheart.com/service/img/nop()/assets/images/05fbb21d-e5c6-4dfc-af2b-b1056e82a745.png">
<meta name="twitter:label1" content="Genre">
<meta name="twitter:data1" content="Classic Rock">
<meta name="twitter:label2" content="Location">
<meta name="twitter:data2" content="National">
Once you've done that, you can go back to the Validator Page (https://cards-dev.twitter.com/validator) to check that everything works the way it should.