WIP on "all the feeds"
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@@ -195,84 +195,119 @@ let home : HttpHandler = fun next ctx -> task {
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| None -> return! Error.notFound next ctx
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}
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/// Functions to support generating RSS feeds
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module Feed =
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open System.IO
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open System.ServiceModel.Syndication
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open System.Text.RegularExpressions
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open System.Xml
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open System.IO
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open System.ServiceModel.Syndication
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open System.Text.RegularExpressions
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open System.Xml
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/// The type of feed to generate
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type FeedType =
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| Standard
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| Category of CategoryId
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| Tag of string
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| Custom of CustomFeed
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/// Derive the type of RSS feed requested
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let deriveFeedType ctx webLog feedPath : (FeedType * int) option =
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let name = $"/{webLog.rss.feedName}"
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let postCount = defaultArg webLog.rss.itemsInFeed webLog.postsPerPage
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// Standard feed
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match webLog.rss.feedEnabled && feedPath = name with
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| true -> Some (Standard, postCount)
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| false ->
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// Category feed
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match CategoryCache.get ctx |> Array.tryFind (fun cat -> cat.slug = feedPath.Replace (name, "")) with
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| Some cat -> Some (Category (CategoryId cat.id), postCount)
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| None ->
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// Tag feed
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match feedPath.StartsWith "/tag/" with
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| true -> Some (Tag (feedPath.Replace("/tag/", "").Replace(name, "")), postCount)
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| false ->
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// Custom feed
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match webLog.rss.customFeeds
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|> List.tryFind (fun it -> (Permalink.toString it.path).EndsWith feedPath) with
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| Some feed ->
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Some (Custom feed,
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feed.podcast |> Option.map (fun p -> p.itemsInFeed) |> Option.defaultValue postCount)
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| None ->
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// No feed
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None
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// GET {any-prescribed-feed}
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let generate (feedType : FeedType) postCount : HttpHandler = fun next ctx -> backgroundTask {
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// TODO: stopped here; use feed type and count in the below function
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let webLog = ctx.WebLog
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let conn = ctx.Conn
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let! posts = Data.Post.findPageOfPublishedPosts webLog.id 1 postCount conn
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let! authors = getAuthors webLog posts conn
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let! tagMaps = getTagMappings webLog posts conn
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let cats = CategoryCache.get ctx
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let toItem (post : Post) =
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let plainText =
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Regex.Replace (post.text, "<(.|\n)*?>", "")
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|> function
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| txt when txt.Length < 255 -> txt
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| txt -> $"{txt.Substring (0, 252)}..."
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let item = SyndicationItem (
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Id = WebLog.absoluteUrl webLog post.permalink,
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Title = TextSyndicationContent.CreateHtmlContent post.title,
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PublishDate = DateTimeOffset post.publishedOn.Value,
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LastUpdatedTime = DateTimeOffset post.updatedOn,
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Content = TextSyndicationContent.CreatePlaintextContent plainText)
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item.AddPermalink (Uri item.Id)
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let encoded =
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post.text.Replace("src=\"/", $"src=\"{webLog.urlBase}/").Replace ("href=\"/", $"href=\"{webLog.urlBase}/")
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item.ElementExtensions.Add ("encoded", "http://purl.org/rss/1.0/modules/content/", encoded)
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item.Authors.Add (SyndicationPerson (
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Name = (authors |> List.find (fun a -> a.name = WebLogUserId.toString post.authorId)).value))
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[ post.categoryIds
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|> List.map (fun catId ->
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let cat = cats |> Array.find (fun c -> c.id = CategoryId.toString catId)
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SyndicationCategory (cat.name, WebLog.absoluteUrl webLog (Permalink $"category/{cat.slug}/"), cat.name))
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post.tags
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|> List.map (fun tag ->
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let urlTag =
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match tagMaps |> List.tryFind (fun tm -> tm.tag = tag) with
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| Some tm -> tm.urlValue
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| None -> tag.Replace (" ", "+")
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SyndicationCategory (tag, WebLog.absoluteUrl webLog (Permalink $"tag/{urlTag}/"), $"{tag} (tag)"))
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]
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|> List.concat
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|> List.iter item.Categories.Add
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item
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let feed = SyndicationFeed ()
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feed.Title <- TextSyndicationContent webLog.name
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feed.Description <- TextSyndicationContent <| defaultArg webLog.subtitle webLog.name
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feed.LastUpdatedTime <- DateTimeOffset <| (List.head posts).updatedOn
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feed.Generator <- generator ctx
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feed.Items <- posts |> Seq.ofList |> Seq.map toItem
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feed.Language <- "en"
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feed.Id <- webLog.urlBase
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feed.Links.Add (SyndicationLink (Uri $"{webLog.urlBase}/feed.xml", "self", "", "application/rss+xml", 0L))
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feed.AttributeExtensions.Add
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(XmlQualifiedName ("content", "http://www.w3.org/2000/xmlns/"), "http://purl.org/rss/1.0/modules/content/")
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feed.ElementExtensions.Add ("link", "", webLog.urlBase)
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use mem = new MemoryStream ()
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use xml = XmlWriter.Create mem
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feed.SaveAsRss20 xml
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xml.Close ()
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let _ = mem.Seek (0L, SeekOrigin.Begin)
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let rdr = new StreamReader(mem)
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let! output = rdr.ReadToEndAsync ()
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return! ( setHttpHeader "Content-Type" "text/xml" >=> setStatusCode 200 >=> setBodyFromString output) next ctx
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}
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// GET /feed.xml
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// (Routing handled by catch-all handler for future configurability)
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let generateFeed : HttpHandler = fun next ctx -> backgroundTask {
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let webLog = ctx.WebLog
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let conn = ctx.Conn
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// TODO: hard-coded number of items
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let! posts = Data.Post.findPageOfPublishedPosts webLog.id 1 10 conn
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let! authors = getAuthors webLog posts conn
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let! tagMaps = getTagMappings webLog posts conn
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let cats = CategoryCache.get ctx
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let toItem (post : Post) =
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let plainText =
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Regex.Replace (post.text, "<(.|\n)*?>", "")
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|> function
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| txt when txt.Length < 255 -> txt
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| txt -> $"{txt.Substring (0, 252)}..."
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let item = SyndicationItem (
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Id = WebLog.absoluteUrl webLog post.permalink,
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Title = TextSyndicationContent.CreateHtmlContent post.title,
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PublishDate = DateTimeOffset post.publishedOn.Value,
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LastUpdatedTime = DateTimeOffset post.updatedOn,
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Content = TextSyndicationContent.CreatePlaintextContent plainText)
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item.AddPermalink (Uri item.Id)
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let encoded =
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post.text.Replace("src=\"/", $"src=\"{webLog.urlBase}/").Replace ("href=\"/", $"href=\"{webLog.urlBase}/")
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item.ElementExtensions.Add ("encoded", "http://purl.org/rss/1.0/modules/content/", encoded)
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item.Authors.Add (SyndicationPerson (
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Name = (authors |> List.find (fun a -> a.name = WebLogUserId.toString post.authorId)).value))
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[ post.categoryIds
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|> List.map (fun catId ->
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let cat = cats |> Array.find (fun c -> c.id = CategoryId.toString catId)
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SyndicationCategory (cat.name, WebLog.absoluteUrl webLog (Permalink $"category/{cat.slug}/"), cat.name))
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post.tags
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|> List.map (fun tag ->
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let urlTag =
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match tagMaps |> List.tryFind (fun tm -> tm.tag = tag) with
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| Some tm -> tm.urlValue
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| None -> tag.Replace (" ", "+")
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SyndicationCategory (tag, WebLog.absoluteUrl webLog (Permalink $"tag/{urlTag}/"), $"{tag} (tag)"))
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]
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|> List.concat
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|> List.iter item.Categories.Add
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item
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let feed = SyndicationFeed ()
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feed.Title <- TextSyndicationContent webLog.name
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feed.Description <- TextSyndicationContent <| defaultArg webLog.subtitle webLog.name
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feed.LastUpdatedTime <- DateTimeOffset <| (List.head posts).updatedOn
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feed.Generator <- generator ctx
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feed.Items <- posts |> Seq.ofList |> Seq.map toItem
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feed.Language <- "en"
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feed.Id <- webLog.urlBase
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feed.Links.Add (SyndicationLink (Uri $"{webLog.urlBase}/feed.xml", "self", "", "application/rss+xml", 0L))
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feed.AttributeExtensions.Add
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(XmlQualifiedName ("content", "http://www.w3.org/2000/xmlns/"), "http://purl.org/rss/1.0/modules/content/")
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feed.ElementExtensions.Add ("link", "", webLog.urlBase)
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use mem = new MemoryStream ()
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use xml = XmlWriter.Create mem
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feed.SaveAsRss20 xml
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xml.Close ()
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let _ = mem.Seek (0L, SeekOrigin.Begin)
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let rdr = new StreamReader(mem)
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let! output = rdr.ReadToEndAsync ()
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return! ( setHttpHeader "Content-Type" "text/xml" >=> setStatusCode 200 >=> setBodyFromString output) next ctx
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}
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/// Sequence where the first returned value is the proper handler for the link
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let private deriveAction (ctx : HttpContext) : HttpHandler seq =
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@@ -281,7 +316,7 @@ let private deriveAction (ctx : HttpContext) : HttpHandler seq =
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let textLink =
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let _, extra = WebLog.hostAndPath webLog
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let url = string ctx.Request.Path
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if extra = "" then url else url.Substring extra.Length
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(if extra = "" then url else url.Substring extra.Length).ToLowerInvariant ()
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let await it = (Async.AwaitTask >> Async.RunSynchronously) it
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seq {
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debug "Post" ctx (fun () -> $"Considering URL {textLink}")
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@@ -303,8 +338,9 @@ let private deriveAction (ctx : HttpContext) : HttpHandler seq =
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|> themedView (defaultArg page.template "single-page") next ctx
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| None -> ()
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// RSS feed
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// TODO: configure this via web log
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if textLink = "/feed.xml" then yield generateFeed
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match Feed.deriveFeedType ctx webLog textLink with
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| Some (feedType, postCount) -> yield Feed.generate feedType postCount
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| None -> ()
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// Post differing only by trailing slash
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let altLink = Permalink (if textLink.EndsWith "/" then textLink[..textLink.Length - 2] else $"{textLink}/")
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match Data.Post.findByPermalink altLink webLog.id conn |> await with
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@@ -3,7 +3,7 @@
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"hostname": "data02.bitbadger.solutions",
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"database": "myWebLog_dev"
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},
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"Generator": "myWebLog 2.0-alpha14",
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"Generator": "myWebLog 2.0-alpha15",
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"Logging": {
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"LogLevel": {
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"MyWebLog.Handlers": "Debug"
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