myWebLog/src/MyWebLog/Maintenance.fs

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2022-06-23 00:35:12 +00:00
module MyWebLog.Maintenance
open System
open System.IO
open Microsoft.Extensions.DependencyInjection
open MyWebLog.Data
/// Create the web log information
let private doCreateWebLog (args : string[]) (sp : IServiceProvider) = task {
let data = sp.GetRequiredService<IData> ()
let timeZone =
let local = TimeZoneInfo.Local.Id
match TimeZoneInfo.Local.HasIanaId with
| true -> local
| false ->
match TimeZoneInfo.TryConvertWindowsIdToIanaId local with
| true, ianaId -> ianaId
| false, _ -> raise <| TimeZoneNotFoundException $"Cannot find IANA timezone for {local}"
// Create the web log
let webLogId = WebLogId.create ()
let userId = WebLogUserId.create ()
let homePageId = PageId.create ()
do! data.WebLog.add
{ WebLog.empty with
id = webLogId
name = args[2]
urlBase = args[1]
defaultPage = PageId.toString homePageId
timeZone = timeZone
}
// Create the admin user
let salt = Guid.NewGuid ()
do! data.WebLogUser.add
{ WebLogUser.empty with
id = userId
webLogId = webLogId
userName = args[3]
firstName = "Admin"
lastName = "User"
preferredName = "Admin"
passwordHash = Handlers.User.hashedPassword args[4] args[3] salt
salt = salt
authorizationLevel = Administrator
}
// Create the default home page
do! data.Page.add
{ Page.empty with
id = homePageId
webLogId = webLogId
authorId = userId
title = "Welcome to myWebLog!"
permalink = Permalink "welcome-to-myweblog.html"
publishedOn = DateTime.UtcNow
updatedOn = DateTime.UtcNow
text = "<p>This is your default home page.</p>"
revisions = [
{ asOf = DateTime.UtcNow
text = Html "<p>This is your default home page.</p>"
}
]
}
printfn $"Successfully initialized database for {args[2]} with URL base {args[1]}"
}
/// Create a new web log
let createWebLog args sp = task {
match args |> Array.length with
| 5 -> do! doCreateWebLog args sp
| _ -> printfn "Usage: MyWebLog init [url] [name] [admin-email] [admin-pw]"
}
/// Import prior permalinks from a text files with lines in the format "[old] [new]"
let importPriorPermalinks urlBase file (sp : IServiceProvider) = task {
let data = sp.GetRequiredService<IData> ()
match! data.WebLog.findByHost urlBase with
| Some webLog ->
let mapping =
File.ReadAllLines file
|> Seq.ofArray
|> Seq.map (fun it ->
let parts = it.Split " "
Permalink parts[0], Permalink parts[1])
for old, current in mapping do
match! data.Post.findByPermalink current webLog.id with
| Some post ->
let! withLinks = data.Post.findFullById post.id post.webLogId
let! _ = data.Post.updatePriorPermalinks post.id post.webLogId
(old :: withLinks.Value.priorPermalinks)
printfn $"{Permalink.toString old} -> {Permalink.toString current}"
| None -> printfn $"Cannot find current post for {Permalink.toString current}"
printfn "Done!"
| None -> eprintfn $"No web log found at {urlBase}"
}
/// Import permalinks if all is well
let importLinks args sp = task {
match args |> Array.length with
| 3 -> do! importPriorPermalinks args[1] args[2] sp
| _ -> printfn "Usage: MyWebLog import-links [url] [file-name]"
}
/// Load a theme from the given ZIP file
let loadTheme (args : string[]) (sp : IServiceProvider) = task {
if args.Length > 1 then
let fileName =
match args[1].LastIndexOf Path.DirectorySeparatorChar with
| -1 -> args[1]
| it -> args[1][(it + 1)..]
match Handlers.Admin.getThemeName fileName with
| Ok themeName ->
let data = sp.GetRequiredService<IData> ()
let clean = if args.Length > 2 then bool.Parse args[2] else true
use stream = File.Open (args[1], FileMode.Open)
use copy = new MemoryStream ()
do! stream.CopyToAsync copy
do! Handlers.Admin.loadThemeFromZip themeName copy clean data
printfn $"Theme {themeName} loaded successfully"
| Error message -> eprintfn $"{message}"
else
printfn "Usage: MyWebLog load-theme [theme-zip-file-name] [*clean-load]"
printfn " * optional, defaults to true"
}
/// Back up a web log's data
module Backup =
open System.Threading.Tasks
open MyWebLog.Converters
open Newtonsoft.Json
/// A theme asset, with the data base-64 encoded
type EncodedAsset =
{ /// The ID of the theme asset
id : ThemeAssetId
/// The updated date for this asset
updatedOn : DateTime
/// The data for this asset, base-64 encoded
data : string
}
/// Create an encoded theme asset from the original theme asset
static member fromAsset (asset : ThemeAsset) =
{ id = asset.id
updatedOn = asset.updatedOn
data = Convert.ToBase64String asset.data
}
/// Create a theme asset from an encoded theme asset
static member fromAsset (asset : EncodedAsset) : ThemeAsset =
{ id = asset.id
updatedOn = asset.updatedOn
data = Convert.FromBase64String asset.data
}
/// A unified archive for a web log
type Archive =
{ /// The web log to which this archive belongs
webLog : WebLog
/// The users for this web log
users : WebLogUser list
/// The theme used by this web log at the time the archive was made
theme : Theme
/// Assets for the theme used by this web log at the time the archive was made
assets : EncodedAsset list
/// The categories for this web log
categories : Category list
/// The tag mappings for this web log
tagMappings : TagMap list
/// The pages for this web log (containing only the most recent revision)
pages : Page list
/// The posts for this web log (containing only the most recent revision)
posts : Post list
}
/// Create a JSON serializer (uses RethinkDB data implementation's JSON converters)
let private getSerializer prettyOutput =
let serializer = JsonSerializer.CreateDefault ()
Json.all () |> Seq.iter serializer.Converters.Add
if prettyOutput then serializer.Formatting <- Formatting.Indented
serializer
/// Display statistics for a backup archive
let private displayStats (msg : string) (webLog : WebLog) archive =
let userCount = List.length archive.users
let assetCount = List.length archive.assets
let categoryCount = List.length archive.categories
let tagMapCount = List.length archive.tagMappings
let pageCount = List.length archive.pages
let postCount = List.length archive.posts
// Create a pluralized output based on the count
let plural count ifOne ifMany =
if count = 1 then ifOne else ifMany
printfn ""
printfn $"""{msg.Replace ("{{NAME}}", webLog.name)}"""
printfn $""" - The theme "{archive.theme.name}" with {assetCount} asset{plural assetCount "" "s"}"""
printfn $""" - {userCount} user{plural userCount "" "s"}"""
printfn $""" - {categoryCount} categor{plural categoryCount "y" "ies"}"""
printfn $""" - {tagMapCount} tag mapping{plural tagMapCount "" "s"}"""
printfn $""" - {pageCount} page{plural pageCount "" "s"}"""
printfn $""" - {postCount} post{plural postCount "" "s"}"""
/// Create a backup archive
let private createBackup webLog (fileName : string) prettyOutput (data : IData) = task {
// Create the data structure
let themeId = ThemeId webLog.themePath
printfn "- Exporting theme..."
let! theme = data.Theme.findById themeId
let! assets = data.ThemeAsset.findByThemeWithData themeId
printfn "- Exporting users..."
let! users = data.WebLogUser.findByWebLog webLog.id
printfn "- Exporting categories and tag mappings..."
let! categories = data.Category.findByWebLog webLog.id
let! tagMaps = data.TagMap.findByWebLog webLog.id
printfn "- Exporting pages..."
let! pages = data.Page.findFullByWebLog webLog.id
printfn "- Exporting posts..."
let! posts = data.Post.findFullByWebLog webLog.id
printfn "- Writing archive..."
let archive = {
webLog = webLog
users = users
theme = Option.get theme
assets = assets |> List.map EncodedAsset.fromAsset
categories = categories
tagMappings = tagMaps
pages = pages |> List.map (fun p -> { p with revisions = List.truncate 1 p.revisions })
posts = posts |> List.map (fun p -> { p with revisions = List.truncate 1 p.revisions })
}
// Write the structure to the backup file
if File.Exists fileName then File.Delete fileName
let serializer = getSerializer prettyOutput
use writer = new StreamWriter (fileName)
serializer.Serialize (writer, archive)
writer.Close ()
displayStats "{{NAME}} backup contains:" webLog archive
}
let private doRestore archive newUrlBase (data : IData) = task {
let! restore = task {
match! data.WebLog.findById archive.webLog.id with
| Some webLog when defaultArg newUrlBase webLog.urlBase = webLog.urlBase ->
do! data.WebLog.delete webLog.id
return archive
| Some _ ->
// Err'body gets new IDs...
let newWebLogId = WebLogId.create ()
let newCatIds = archive.categories |> List.map (fun cat -> cat.id, CategoryId.create ()) |> dict
let newMapIds = archive.tagMappings |> List.map (fun tm -> tm.id, TagMapId.create ()) |> dict
let newPageIds = archive.pages |> List.map (fun page -> page.id, PageId.create ()) |> dict
let newPostIds = archive.posts |> List.map (fun post -> post.id, PostId.create ()) |> dict
let newUserIds = archive.users |> List.map (fun user -> user.id, WebLogUserId.create ()) |> dict
return
{ archive with
webLog = { archive.webLog with id = newWebLogId; urlBase = Option.get newUrlBase }
users = archive.users
|> List.map (fun u -> { u with id = newUserIds[u.id]; webLogId = newWebLogId })
categories = archive.categories
|> List.map (fun c -> { c with id = newCatIds[c.id]; webLogId = newWebLogId })
tagMappings = archive.tagMappings
|> List.map (fun tm -> { tm with id = newMapIds[tm.id]; webLogId = newWebLogId })
pages = archive.pages
|> List.map (fun page ->
{ page with
id = newPageIds[page.id]
webLogId = newWebLogId
authorId = newUserIds[page.authorId]
})
posts = archive.posts
|> List.map (fun post ->
{ post with
id = newPostIds[post.id]
webLogId = newWebLogId
authorId = newUserIds[post.authorId]
categoryIds = post.categoryIds |> List.map (fun c -> newCatIds[c])
})
}
| None ->
return
{ archive with
webLog = { archive.webLog with urlBase = defaultArg newUrlBase archive.webLog.urlBase }
}
}
// Restore theme and assets (one at a time, as assets can be large)
printfn ""
printfn "- Importing theme..."
do! data.Theme.save restore.theme
let! _ = restore.assets |> List.map (EncodedAsset.fromAsset >> data.ThemeAsset.save) |> Task.WhenAll
// Restore web log data
printfn "- Restoring web log..."
do! data.WebLog.add restore.webLog
printfn "- Restoring users..."
do! data.WebLogUser.restore restore.users
printfn "- Restoring categories and tag mappings..."
do! data.TagMap.restore restore.tagMappings
do! data.Category.restore restore.categories
printfn "- Restoring pages..."
do! data.Page.restore restore.pages
printfn "- Restoring posts..."
do! data.Post.restore restore.posts
// TODO: comments not yet implemented
displayStats "Restored for {{NAME}}:" restore.webLog restore
}
/// Decide whether to restore a backup
let private restoreBackup (fileName : string) newUrlBase promptForOverwrite data = task {
let serializer = getSerializer false
use stream = new FileStream (fileName, FileMode.Open)
use reader = new StreamReader (stream)
use jsonReader = new JsonTextReader (reader)
let archive = serializer.Deserialize<Archive> jsonReader
let mutable doOverwrite = not promptForOverwrite
if promptForOverwrite then
printfn "** WARNING: Restoring a web log will delete existing data for that web log"
printfn " (unless restoring to a different URL base), and will overwrite the"
printfn " theme in either case."
printfn ""
printf "Continue? [Y/n] "
doOverwrite <- not ((Console.ReadKey ()).Key = ConsoleKey.N)
if doOverwrite then
do! doRestore archive newUrlBase data
else
printfn $"{archive.webLog.name} backup restoration canceled"
}
/// Generate a backup archive
let generateBackup (args : string[]) (sp : IServiceProvider) = task {
if args.Length = 3 || args.Length = 4 then
let data = sp.GetRequiredService<IData> ()
match! data.WebLog.findByHost args[1] with
| Some webLog ->
let fileName = if args[2].EndsWith ".json" then args[2] else $"{args[2]}.json"
let prettyOutput = args.Length = 4 && args[3] = "pretty"
do! createBackup webLog fileName prettyOutput data
| None -> printfn $"Error: no web log found for {args[1]}"
else
printfn """Usage: MyWebLog backup [url-base] [backup-file-name] [*"pretty"]"""
printfn """ * optional - default is non-pretty JSON output"""
}
/// Restore a backup archive
let restoreFromBackup (args : string[]) (sp : IServiceProvider) = task {
if args.Length = 2 || args.Length = 3 then
let data = sp.GetRequiredService<IData> ()
let newUrlBase = if args.Length = 3 then Some args[2] else None
do! restoreBackup args[1] newUrlBase (args[0] <> "do-restore") data
else
printfn "Usage: MyWebLog restore [backup-file-name] [*url-base]"
printfn " * optional - will restore to original URL base if omitted"
printfn " (use do-restore to skip confirmation prompt)"
}