Add meta item

- Use meta item for category/author lookups
- Add Liquid filter to get values from meta item lists
- Implement log on "returnUrl" parameter

src/MyWebLog.Data/Data.fs

@@ -204,14 +204,14 @@ module Category =
     }
     
     /// Get a category ID -> name dictionary for the given category IDs
-    let findNames (catIds : CategoryId list) (webLogId : WebLogId) conn = backgroundTask {
+    let findNames (webLogId : WebLogId) conn (catIds : CategoryId list) = backgroundTask {
         let! cats = rethink<Category list> {
             withTable Table.Category
             getAll (catIds |> List.map (fun it -> it :> obj))
             filter "webLogId" webLogId
             result; withRetryDefault conn
         }
-        return cats |> List.map (fun c -> CategoryId.toString c.id, c.name) |> dict
+        return cats |> List.map (fun c -> { name = CategoryId.toString c.id; value = c.name})
     }
     
     /// Update a category
@@ -504,12 +504,12 @@ module WebLogUser =
         |> tryFirst
     
     /// Get a user ID -> name dictionary for the given user IDs
-    let findNames (userIds : WebLogUserId list) (webLogId : WebLogId) conn = backgroundTask {
+    let findNames (webLogId : WebLogId) conn (userIds : WebLogUserId list) = backgroundTask {
         let! users = rethink<WebLogUser list> {
             withTable Table.WebLogUser
             getAll (userIds |> List.map (fun it -> it :> obj))
             filter "webLogId" webLogId
             result; withRetryDefault conn
         }
-        return users |> List.map (fun u -> WebLogUserId.toString u.id, WebLogUser.displayName u) |> dict
+        return users |> List.map (fun u -> { name = WebLogUserId.toString u.id; value = WebLogUser.displayName u })
     }

src/MyWebLog.Domain/SupportTypes.fs

@@ -88,6 +88,17 @@ module MarkupText =
         | text -> invalidOp $"Cannot derive type of text ({text})"
 
 
+/// An item of metadata
+[<CLIMutable; NoComparison; NoEquality>]
+type MetaItem =
+    {   /// The name of the metadata value
+        name : string
+        
+        /// The metadata value
+        value : string
+    }
+
+
 /// A revision of a page or post
 [<CLIMutable; NoComparison; NoEquality>]
 type Revision =

src/MyWebLog.Domain/ViewModels.fs

@@ -209,7 +209,14 @@ type LogOnModel =
     
         /// The user's password
         password : string
+        
+        /// Where the user should be redirected once they have logged on
+        returnTo : string option
     }
+    
+    /// An empty log on model
+    static member empty =
+        { emailAddress = ""; password = ""; returnTo = None }
 
 
 /// View model for posts in a list
@@ -221,9 +228,6 @@ type PostListItem =
         /// The ID of the user who authored the post
         authorId : string
         
-        /// The name of the user who authored the post
-        authorName : string
-        
         /// The status of the post
         status : string
         
@@ -243,25 +247,24 @@ type PostListItem =
         text : string
         
         /// The IDs of the categories for this post
-        categoryIds : string[]
+        categoryIds : string list
         
         /// Tags for the post
-        tags : string[]
+        tags : string list
     }
 
     /// Create a post list item from a post
     static member fromPost (post : Post) =
         { id          = PostId.toString post.id
           authorId    = WebLogUserId.toString post.authorId
-          authorName  = ""
           status      = PostStatus.toString   post.status
           title       = post.title
           permalink   = Permalink.toString post.permalink
           publishedOn = Option.toNullable post.publishedOn
           updatedOn   = post.updatedOn
           text        = post.text
-          categoryIds = post.categoryIds |> List.map CategoryId.toString |> Array.ofList
-          tags        = Array.ofList post.tags
+          categoryIds = post.categoryIds |> List.map CategoryId.toString
+          tags        = post.tags
         }
 
 
@@ -270,8 +273,11 @@ type PostDisplay =
     {   /// The posts to be displayed
         posts : PostListItem[]
         
+        /// Author ID -> name lookup
+        authors : MetaItem list
+        
         /// Category ID -> name lookup
-        categories : IDictionary<string, string>
+        categories : MetaItem list
         
         /// A subtitle for the page
         subtitle : string option

src/MyWebLog/Handlers.fs

@@ -424,19 +424,25 @@ module Post =
     /// Convert a list of posts into items ready to be displayed
     let private preparePostList (webLog : WebLog) (posts : Post list) pageNbr perPage conn = task {
         let! authors =
-            Data.WebLogUser.findNames (posts |> List.map (fun p -> p.authorId) |> List.distinct) webLog.id conn
+            posts
+            |> List.map (fun p -> p.authorId)
+            |> List.distinct
+            |> Data.WebLogUser.findNames webLog.id conn
         let! cats =
-            Data.Category.findNames (posts |> List.map (fun c -> c.categoryIds) |> List.concat |> List.distinct)
-                webLog.id conn
+            posts
+            |> List.map (fun c -> c.categoryIds)
+            |> List.concat
+            |> List.distinct
+            |> Data.Category.findNames webLog.id conn
         let postItems =
             posts
             |> Seq.ofList
             |> Seq.truncate perPage
             |> Seq.map PostListItem.fromPost
-            |> Seq.map (fun pi -> { pi with authorName = authors[pi.authorId] })
             |> Array.ofSeq
         let model =
             { posts      = postItems
+              authors    = authors
               categories = cats
               subtitle   = None
               hasNewer   = pageNbr <> 1
@@ -606,9 +612,20 @@ module User =
         Convert.ToBase64String (alg.GetBytes 64)
     
     // GET /user/log-on
-    let logOn : HttpHandler = fun next ctx -> task {
+    let logOn returnUrl : HttpHandler = fun next ctx -> task {
+        let returnTo =
+            match returnUrl with
+            | Some _ -> returnUrl
+            | None ->
+                match ctx.Request.Query.ContainsKey "returnUrl" with
+                | true -> Some ctx.Request.Query["returnUrl"].[0]
+                | false -> None
         return!
-            Hash.FromAnonymousObject {| page_title = "Log On"; csrf = (csrfToken ctx) |}
+            Hash.FromAnonymousObject {|
+                model      = { LogOnModel.empty with returnTo = returnTo }
+                page_title = "Log On"
+                csrf       = csrfToken ctx
+            |}
             |> viewForTheme "admin" "log-on" next ctx
     }
     
@@ -629,14 +646,11 @@ module User =
             do! ctx.SignInAsync (identity.AuthenticationType, ClaimsPrincipal identity,
                 AuthenticationProperties (IssuedUtc = DateTimeOffset.UtcNow))
             do! addMessage ctx
-                    { UserMessage.success with
-                        message = "Logged on successfully"
-                        detail = Some $"Welcome to {webLog.name}!"
-                    }
-            return! redirectToGet "/admin" next ctx
+                    { UserMessage.success with message = $"Logged on successfully | Welcome to {webLog.name}!" }
+            return! redirectToGet (match model.returnTo with Some url -> url | None -> "/admin") next ctx
         | _ ->
             do! addMessage ctx { UserMessage.error with message = "Log on attempt unsuccessful" }
-            return! logOn next ctx
+            return! logOn model.returnTo next ctx
     }
 
     // GET /user/log-off
@@ -696,7 +710,7 @@ let endpoints = [
     ]
     subRoute "/user" [
         GET [
-            route "/log-on"  User.logOn
+            route "/log-on"  (User.logOn None)
             route "/log-off" User.logOff
         ]
         POST [

src/MyWebLog/Program.fs

@@ -58,6 +58,14 @@ module DotLiquidBespoke =
                 "</ul>"
             }
             |> Seq.iter result.WriteLine
+    
+    /// A filter to retrieve the value of a meta item from a list
+    //    (shorter than `{% assign item = list | where: "name", [name] | first %}{{ item.value }}`)
+    type ValueFilter () =
+        static member Value (_ : Context, items : MetaItem list, name : string) =
+            match items |> List.tryFind (fun it -> it.name = name) with
+            | Some item -> item.value
+            | None -> $"-- {name} not found --"
 
 
 /// Create the default information for a new web log
@@ -192,16 +200,18 @@ let main args =
     
     // Set up DotLiquid
     Template.RegisterFilter typeof<DotLiquidBespoke.NavLinkFilter>
+    Template.RegisterFilter typeof<DotLiquidBespoke.ValueFilter>
     Template.RegisterTag<DotLiquidBespoke.UserLinksTag> "user_links"
     
     [   // Domain types
-        typeof<Page>; typeof<WebLog>
+        typeof<MetaItem>; typeof<Page>; typeof<WebLog>
         // View models
         typeof<DashboardModel>; typeof<DisplayCategory>; typeof<DisplayPage>; typeof<EditCategoryModel>
-        typeof<EditPageModel>;  typeof<EditPostModel>;   typeof<PostDisplay>; typeof<PostListItem>
-        typeof<SettingsModel>;  typeof<UserMessage>
+        typeof<EditPageModel>;  typeof<EditPostModel>;   typeof<LogOnModel>;  typeof<PostDisplay>
+        typeof<PostListItem>;   typeof<SettingsModel>;   typeof<UserMessage>
         // Framework types
-        typeof<AntiforgeryTokenSet>; typeof<string option>; typeof<KeyValuePair>
+        typeof<AntiforgeryTokenSet>; typeof<KeyValuePair>; typeof<MetaItem list>; typeof<string list>
+        typeof<string option>
     ]
     |> List.iter (fun it -> Template.RegisterSafeType (it, [| "*" |]))
 

src/MyWebLog/themes/admin/log-on.liquid

@@ -2,6 +2,9 @@
 <article class="py-3">
   <form action="/user/log-on" method="post">
     <input type="hidden" name="{{ csrf.form_field_name }}" value="{{ csrf.request_token }}">
+    {% if model.return_to %}
+      <input type="hidden" name="returnTo" value="{{ model.return_to.value }}">
+    {% endif %}
     <div class="container">
       <div class="row pb-3">
         <div class="col col-md-6 col-lg-4 offset-lg-2">

src/MyWebLog/themes/admin/post-list.liquid

@@ -31,7 +31,7 @@
               <a href="#" class="text-danger">Delete</a>
             </small>
           </td>
-          <td>{{ post.author_name }}</td>
+          <td>{{ model.authors | value: post.author_id }}</td>
           <td>{{ post.status }}</td>
           <td>{{ post.tags | join: ", " }}</td>
         </tr>

src/MyWebLog/themes/default/index.liquid

@@ -14,10 +14,30 @@
           <p>
             Published on {{ post.published_on | date: "MMMM d, yyyy" }}
             at {{ post.published_on | date: "h:mmtt" | downcase }}
+            by {{ model.authors | value: post.author_id }}
           </p>
           {{ post.text }}
+          {%- assign category_count = post.category_ids | size -%}
+          {%- assign tag_count = post.tags | size -%}
+          {% if category_count > 0 or tag_count > 0 %}
+            <footer>
+              <p>
+                {%- if category_count > 0 -%}
+                  {%- for cat in post.category_ids -%}
+                    {%- assign cat_names = model.categories | value: cat | split: "," | concat: cat_names -%}
+                  {%- endfor -%}
+                  Categorized under: {{ cat_names | reverse | join: ", " }}<br>
+                  {%- assign cat_names = "" -%}
+                {% endif -%}
+                {%- if tag_count > 0 %}
+                  Tagged: {{ post.tags | join: ", " }}
+                {% endif -%}
+              </p>
+            </footer>
+          {% endif %}
+          <hr>
         </article>
       </div>
     </div>
   {% endfor %}
-</section>
+</section>