Dust off gophertype and fix some bugs

* Add a rate limiter to the login page. * Fix the CSRF cookie expiring after 24 hours; it now will be a session cookie that expires on browser exit so you get a fresh one each visit. * Remove the dependency on go-bindata and use native Go file embed * Add documentation
2022-12-05 21:07:52 -08:00 · 2022-12-05 21:07:52 -08:00 · 777fd85085
parent e9e58748b4
commit 777fd85085
12 changed files with 500 additions and 156 deletions
--- a/13
+++ b/13
@ -11,7 +11,6 @@ LDFLAGS := -ldflags "-X main.Build=$(BUILD) -X main.BuildDate=$(BUILD_DATE)"
 # `make setup` to set up a new environment, pull dependencies, etc.
 .PHONY: setup
 setup: clean
-	go get -u github.com/go-bindata/go-bindata/...
 	go get ./...

 # `make build` to build the binary.
@ -21,17 +20,7 @@ build:

 # `make buildall` to run all build steps including doodads and bindata.
 .PHONY: buildall
-buildall: bindata build
-
-# `make bindata` generates the embedded binary assets package.
-.PHONY: bindata
-bindata:
-	go-bindata -pkg bundled -o pkg/bundled/bindata.go -prefix pvt-www pvt-www/...
-
-# `make bindata-dev` generates the debug version of bindata package.
-.PHONY: bindata-dev
-bindata-dev:
-	go-bindata -debug -pkg bundled -o pkg/bundled/bindata.go -prefix pvt-www pvt-www/...
+buildall: build

 # `make install` to install the Go binaries to your GOPATH.
 .PHONY: install
--- a/README.md
+++ b/README.md
@ -1 +1,68 @@
 # Gophertype
+
+This is a simple web blog engine written in Go.
+
+## Dependencies
+
+This app expects you to have a Redis cache server running on localhost. Redis
+is used for rate limiting and to cache Pygments code highlight blocks in
+Markdown files.
+
+The Python `pygmentize` program should also be available if you want code
+highlight in Markdown.
+
+## Usage
+
+For database, this app can use SQLite, MySQL or PostgreSQL; use **one** of the
+options. Easiest is to use a SQLite database for local development.
+
+```bash
+Usage of gophertype:
+  -bind string
+    	Bind address for HTTP server (default ":8000")
+  -debug
+    	Debug level logging
+  -mysql string
+    	Use MySQL database, format: user:password@/dbname?charset=utf8&parseTime=True&loc=Local
+  -postgres string
+    	Use Postgres database, format: host=myhost port=myport user=gorm dbname=gorm password=mypassword
+  -root string
+    	User root for custom web pages (default "./public_html")
+  -sqlite3 string
+    	Use SQLite database, default 'database.sqlite'
+  -v	Show version number and exit (alias)
+  -version
+    	Show version number and exit
+```
+
+Example:
+
+```bash
+gophertype -debug -sqlite database.sqlite -root ./public_html
+```
+
+## Architecture
+
+Gophertype runs on a dual templating system: it has its own built-in store of
+default pages to run the core features of the blog, and a public user root for
+your own pages and you can override the built-in defaults by creating files with
+the same name.
+
+The `pvt-www/` folder contains the built-in templates (these get bundled into
+the binary when compiled), and `public_html` is the default user root (which you
+can change with the `-root` command line parameter).
+
+## Pages and Markdown Support
+
+Everything under the user root is basically served as static files from disk, so
+you can arrange images and JavaScript paths and embed everything as normal.
+
+A couple types of files are handled specially:
+
+* Go templates (`*.gohtml`) are processed with the html/template module.
+* Markdown files (`*.md`) are supported and will render as HTML wrapped in
+  an HTML template providing your blog's normal layout and decorations.
+
+## License
+
+Copyright 2022 Noah Petherbridge, all rights reserved.
--- a/go.mod
+++ b/go.mod
@ -1,28 +1,55 @@
 module git.kirsle.net/apps/gophertype

-go 1.13
+go 1.19

 require (
 	github.com/albrow/forms v0.3.3
-	github.com/edwvee/exiffix v0.0.0-20180602190213-b57537c92a6b
-	github.com/go-redis/redis v6.15.9+incompatible // indirect
-	github.com/go-redis/redis/v8 v8.9.0 // indirect
+	github.com/edwvee/exiffix v0.0.0-20210922235313-0f6cbda5e58f
+	github.com/go-redis/redis/v8 v8.11.5
 	github.com/gorilla/feeds v1.1.1
-	github.com/gorilla/mux v1.7.3
-	github.com/gorilla/sessions v1.2.0
-	github.com/jinzhu/gorm v1.9.11
+	github.com/gorilla/mux v1.8.0
+	github.com/gorilla/sessions v1.2.1
+	github.com/jinzhu/gorm v1.9.16
 	github.com/kirsle/blog v0.0.0-20191022175051-d78814b9c99b
 	github.com/kirsle/golog v0.0.0-20180411020913-51290b4f9292
-	github.com/kr/pretty v0.2.1 // indirect
-	github.com/mattn/go-sqlite3 v1.14.7 // indirect
-	github.com/microcosm-cc/bluemonday v1.0.2
+	github.com/microcosm-cc/bluemonday v1.0.21
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	github.com/satori/go.uuid v1.2.0
-	github.com/shurcooL/github_flavored_markdown v0.0.0-20181002035957-2122de532470
-	github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 // indirect
-	github.com/shurcooL/go-goon v0.0.0-20210110234559-7585751d9a17 // indirect
+	github.com/shurcooL/github_flavored_markdown v0.0.0-20210228213109-c3a9aa474629
 	github.com/urfave/negroni v1.0.0
-	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
-	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
+	golang.org/x/crypto v0.3.0
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 )
+
+require (
+	github.com/aymerick/douceur v0.2.0 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/disintegration/imaging v1.6.2 // indirect
+	github.com/go-sql-driver/mysql v1.7.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/gorilla/css v1.0.0 // indirect
+	github.com/gorilla/securecookie v1.1.1 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/kr/pretty v0.2.1 // indirect
+	github.com/lib/pq v1.10.7 // indirect
+	github.com/mattn/go-sqlite3 v1.14.16 // indirect
+	github.com/russross/blackfriday v1.6.0 // indirect
+	github.com/rwcarlsen/goexif v0.0.0-20190401172101-9e8deecbddbd // indirect
+	github.com/sergi/go-diff v1.2.0 // indirect
+	github.com/shurcooL/go v0.0.0-20200502201357-93f07166e636 // indirect
+	github.com/shurcooL/go-goon v0.0.0-20210110234559-7585751d9a17 // indirect
+	github.com/shurcooL/highlight_diff v0.0.0-20181222201841-111da2e7d480 // indirect
+	github.com/shurcooL/highlight_go v0.0.0-20191220051317-782971ddf21b // indirect
+	github.com/shurcooL/octicon v0.0.0-20191102190552-cbb32d6a785c // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	github.com/sourcegraph/annotate v0.0.0-20160123013949-f4cad6c6324d // indirect
+	github.com/sourcegraph/syntaxhighlight v0.0.0-20170531221838-bd320f5d308e // indirect
+	github.com/stretchr/testify v1.8.1 // indirect
+	github.com/tomnomnom/xtermcolor v0.0.0-20160428124646-b78803f00a7e // indirect
+	golang.org/x/image v0.2.0 // indirect
+	golang.org/x/net v0.3.0 // indirect
+	golang.org/x/sys v0.3.0 // indirect
+	golang.org/x/term v0.3.0 // indirect
+	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
+)
--- a/go.sum
+++ b/go.sum
@ -1,89 +1,89 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.37.4 h1:glPeL3BQJsbF6aIIYfZizMwc5LTYz250bDMjttbBGAU=
 cloud.google.com/go v0.37.4/go.mod h1:NHPJ89PdicEuT9hdPXMROBD91xc5uRDxsMtSB16k7hw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/albrow/forms v0.3.3 h1:+40fCsDyS2lU97IEeed7bnUGENvlVzppQGBGy6kd77E=
 github.com/albrow/forms v0.3.3/go.mod h1:jvrM3b0gPuIRiY1E/KmKfPk2XXDEKj7yFB+g9g0BItQ=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
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-github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
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+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
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 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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-github.com/denisenkom/go-mssqldb v0.0.0-20190515213511-eb9f6a1743f3 h1:tkum0XDgfR0jcVVXuTsYv/erY2NnEDqwRojbxR1rBYA=
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 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
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 github.com/disintegration/imaging v1.6.0/go.mod h1:xuIt+sRxDFrHS0drzXUlCJthkJ8k7lkkUojDSR247MQ=
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 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
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@ -206,13 +211,14 @@ golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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@ -220,25 +226,31 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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@ -246,41 +258,35 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
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 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
 gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df h1:n7WqCuqOuCbNr617RXOY0AWRXxgwEyPp2z+p0+hgMuE=
 gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkpBDuZnXENFzX8qRjMDMyPD6BRkCw=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/pkg/cache/redis.go
+++ b/pkg/cache/redis.go
@ -2,58 +2,89 @@
 package cache

 import (
-    "fmt"
-    "errors"
-    "context"
-    "time"
-    redis "github.com/go-redis/redis/v8"
-    "git.kirsle.net/apps/gophertype/pkg/settings"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"time"
+
+	"git.kirsle.net/apps/gophertype/pkg/settings"
+	redis "github.com/go-redis/redis/v8"
 )

 // Global Redis configuration.
 var (
-    RedisHost = "localhost"
-    RedisPort = 6379
-    RedisDB = 0
+	RedisHost = "localhost"
+	RedisPort = 6379
+	RedisDB   = 0

-    RedisClient *redis.Client
-    ready bool
+	RedisClient *redis.Client
+	ready       bool
 )

 // Error codes
 var (
-    ErrNotReady = errors.New("RedisClient not ready")
+	ErrNotReady = errors.New("RedisClient not ready")
 )

 // Connect to Redis after loading the details from the site's settings.json.
 func Connect() error {
-    set := settings.Current
-    if set.RedisEnabled {
-        RedisClient = redis.NewClient(&redis.Options{
-            Addr: fmt.Sprintf("%s:%d", set.RedisHost, set.RedisPort),
-            DB: set.RedisDB,
-        })
-        return nil
-    }
-    return errors.New("Redis not enabled in .settings.json")
+	set := settings.Current
+	if set.RedisEnabled {
+		RedisClient = redis.NewClient(&redis.Options{
+			Addr: fmt.Sprintf("%s:%d", set.RedisHost, set.RedisPort),
+			DB:   set.RedisDB,
+		})
+		return nil
+	}
+	return errors.New("Redis not enabled in .settings.json")
 }

 // SetEx sets a cache key with expiration.
 func SetEx(key string, value string, exp int64) error {
-    if RedisClient == nil {
-        return ErrNotReady
-    }
+	if RedisClient == nil {
+		return ErrNotReady
+	}

-    err := RedisClient.Set(context.Background(), key, value, time.Duration(exp) * time.Second).Err()
-    return err
+	err := RedisClient.Set(context.Background(), key, value, time.Duration(exp)*time.Second).Err()
+	return err
 }

 // Get a cache key.
 func Get(key string) (string, error) {
-    if RedisClient == nil {
-        return "", ErrNotReady
-    }
+	if RedisClient == nil {
+		return "", ErrNotReady
+	}

-    val, err := RedisClient.Get(context.Background(), key).Result()
-    return val, err
+	val, err := RedisClient.Get(context.Background(), key).Result()
+	return val, err
+}
+
+// GetJSON gets a JSON serialized value out of Redis.
+func GetJSON(key string, v any) error {
+	if val, err := Get(key); err != nil {
+		return err
+	} else {
+		return json.Unmarshal([]byte(val), v)
+	}
+}
+
+// Set sets a JSON serializable object in Redis.
+func SetJSON(key string, v interface{}, expire time.Duration) error {
+	bin, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+
+	_, err = RedisClient.Set(context.Background(), key, bin, expire).Result()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Delete a key from Redis.
+func Delete(key string) error {
+	return RedisClient.Del(context.Background(), key).Err()
 }
--- a/pkg/constants/constants.go
+++ b/pkg/constants/constants.go
@ -1,8 +1,17 @@
 package constants

+import "time"
+
 // Misc constants.
 const (
 	// Password values
 	PasswordMinLength = 8
 	BcryptCost        = 14
+
+	// Rate limits
+	RateLimitRedisKey        = "rate-limit/%s/%s" // namespace, id
+	LoginRateLimitWindow     = 1 * time.Hour
+	LoginRateLimit           = 10 // 10 failed login attempts = locked for full hour
+	LoginRateLimitCooldownAt = 3  // 3 failed attempts = start throttling
+	LoginRateLimitCooldown   = 30 * time.Second
 )
--- a/pkg/controllers/authentication.go
+++ b/pkg/controllers/authentication.go
@ -4,8 +4,11 @@ import (
 	"net/http"

 	"git.kirsle.net/apps/gophertype/pkg/authentication"
+	"git.kirsle.net/apps/gophertype/pkg/console"
+	"git.kirsle.net/apps/gophertype/pkg/constants"
 	"git.kirsle.net/apps/gophertype/pkg/glue"
 	"git.kirsle.net/apps/gophertype/pkg/models"
+	"git.kirsle.net/apps/gophertype/pkg/ratelimit"
 	"git.kirsle.net/apps/gophertype/pkg/responses"
 	"git.kirsle.net/apps/gophertype/pkg/session"
 	"github.com/albrow/forms"
@ -34,13 +37,31 @@ func init() {
 					break
 				}

+				// Rate limit failed login attempts.
+				limiter := &ratelimit.Limiter{
+					Namespace:  "login",
+					ID:         form.Get("email"),
+					Limit:      constants.LoginRateLimit,
+					Window:     constants.LoginRateLimitWindow,
+					CooldownAt: constants.LoginRateLimitCooldownAt,
+					Cooldown:   constants.LoginRateLimitCooldown,
+				}
+
 				// Check authentication.
 				user, err := models.Users.AuthenticateUser(form.Get("email"), form.Get("password"))
 				if err != nil {
+					if err := limiter.Ping(); err != nil {
+						v.Error = err
+						break
+					}
 					v.Error = err
 					break
 				}

+				if err := limiter.Clear(); err != nil {
+					console.Error("Failed to clear the login rate limiter: %s", err)
+				}
+
 				_ = user

 				authentication.Login(w, r, user)
--- a/pkg/middleware/csrf.go
+++ b/pkg/middleware/csrf.go
@ -3,7 +3,6 @@ package middleware
 import (
 	"context"
 	"net/http"
-	"time"

 	"git.kirsle.net/apps/gophertype/pkg/constants"
 	"git.kirsle.net/apps/gophertype/pkg/responses"
@ -27,9 +26,8 @@ func CSRF(next http.Handler) http.Handler {
 		if len(token) < 8 || err != nil {
 			token = uuid.NewV4().String()
 			cookie = &http.Cookie{
-				Name:    constants.CSRFCookieName,
-				Value:   token,
-				Expires: time.Now().Add(24 * time.Hour),
+				Name:  constants.CSRFCookieName,
+				Value: token,
 			}
 			http.SetCookie(w, cookie)
 		}
--- a/pkg/ratelimit/ratelimit.go
+++ b/pkg/ratelimit/ratelimit.go
@ -0,0 +1,139 @@
+package ratelimit
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"git.kirsle.net/apps/gophertype/pkg/cache"
+	"git.kirsle.net/apps/gophertype/pkg/constants"
+)
+
+// Limiter implements a Redis-backed rate limit for logins or otherwise.
+type Limiter struct {
+	Namespace  string        // kind of rate limiter ("login")
+	ID         interface{}   // unique ID of the resource being pinged (str or ints)
+	Limit      int           // how many pings within the window period
+	Window     time.Duration // the window period/expiration of Redis key
+	CooldownAt int           // how many pings before the cooldown is enforced
+	Cooldown   time.Duration // time to wait between fails
+}
+
+// Redis object behind the rate limiter.
+type Data struct {
+	Pings     int
+	NotBefore time.Time
+}
+
+// Ping the rate limiter.
+func (l *Limiter) Ping() error {
+	var (
+		key = l.Key()
+		now = time.Now()
+	)
+
+	// Get stored data from Redis if any.
+	var data Data
+	cache.GetJSON(key, &data)
+
+	// Are we cooling down?
+	if now.Before(data.NotBefore) {
+		return fmt.Errorf(
+			"You are doing that too often. Please wait %s before trying again",
+			FormatDurationCoarse(data.NotBefore.Sub(now)),
+		)
+	}
+
+	// Increment the ping count.
+	data.Pings++
+
+	// Have we hit the wall?
+	if data.Pings >= l.Limit {
+		return fmt.Errorf(
+			"You have hit the rate limit; please wait the full %s before trying again",
+			FormatDurationCoarse(l.Window),
+		)
+	}
+
+	// Are we throttled?
+	if l.CooldownAt > 0 && data.Pings > l.CooldownAt {
+		data.NotBefore = now.Add(l.Cooldown)
+		if err := cache.SetJSON(key, data, l.Window); err != nil {
+			return fmt.Errorf("Couldn't set Redis key for rate limiter: %s", err)
+		}
+		return fmt.Errorf(
+			"Please wait %s before trying again. You have %d more attempt(s) remaining before you will be locked "+
+				"out for %s",
+			FormatDurationCoarse(l.Cooldown),
+			l.Limit-data.Pings,
+			FormatDurationCoarse(l.Window),
+		)
+	}
+
+	// Save their ping count to Redis.
+	if err := cache.SetJSON(key, data, l.Window); err != nil {
+		return fmt.Errorf("Couldn't set Redis key for rate limiter: %s", err)
+	}
+
+	return nil
+}
+
+// Clear the rate limiter, cleaning up the Redis key (e.g., after successful login).
+func (l *Limiter) Clear() error {
+	return cache.Delete(l.Key())
+}
+
+// Key formats the Redis key.
+func (l *Limiter) Key() string {
+	var str string
+	switch t := l.ID.(type) {
+	case int:
+		str = fmt.Sprintf("%d", t)
+	case uint64:
+		str = fmt.Sprintf("%d", t)
+	case int64:
+		str = fmt.Sprintf("%d", t)
+	case uint32:
+		str = fmt.Sprintf("%d", t)
+	case int32:
+		str = fmt.Sprintf("%d", t)
+	default:
+		str = fmt.Sprintf("%s", t)
+	}
+	return fmt.Sprintf(constants.RateLimitRedisKey, l.Namespace, str)
+}
+
+// FormatDurationCoarse returns a pretty printed duration with coarse granularity.
+func FormatDurationCoarse(duration time.Duration) string {
+	var result = func(text string, v int64) string {
+		if v == 1 {
+			text = strings.TrimSuffix(text, "s")
+		}
+		return fmt.Sprintf(text, v)
+	}
+
+	if duration.Seconds() < 60.0 {
+		return result("%d seconds", int64(duration.Seconds()))
+	}
+
+	if duration.Minutes() < 60.0 {
+		return result("%d minutes", int64(duration.Minutes()))
+	}
+
+	if duration.Hours() < 24.0 {
+		return result("%d hours", int64(duration.Hours()))
+	}
+
+	days := int64(duration.Hours() / 24)
+	if days < 30 {
+		return result("%d days", days)
+	}
+
+	months := int64(days / 30)
+	if months < 12 {
+		return result("%d months", months)
+	}
+
+	years := int64(days / 365)
+	return result("%d years", years)
+}
--- a/pkg/responses/filesystem.go
+++ b/pkg/responses/filesystem.go
@ -8,8 +8,8 @@ import (
 	"path/filepath"
 	"strings"

-	"git.kirsle.net/apps/gophertype/pkg/bundled"
 	"git.kirsle.net/apps/gophertype/pkg/settings"
+	assets "git.kirsle.net/apps/gophertype/pvt-www"
 )

 // GetFile returns the template file's data, wherever it is.
@ -22,7 +22,7 @@ func GetFile(path string) ([]byte, error) {
 	}

 	// Fall back on embedded bindata.
-	if b, err := bundled.Asset(path); err == nil {
+	if b, err := assets.Asset(path); err == nil {
 		return b, nil
 	}

@ -32,7 +32,7 @@ func GetFile(path string) ([]byte, error) {
 // GetFileExists checks if the file exists but doesn't return its data.
 func GetFileExists(path string) bool {
 	// Check bindata.
-	if _, err := bundled.Asset(path); err == nil {
+	if _, err := assets.Asset(path); err == nil {
 		return true
 	}

--- a/pkg/responses/static_file.go
+++ b/pkg/responses/static_file.go
@ -5,8 +5,8 @@ import (
 	"net/http"
 	"path/filepath"

-	"git.kirsle.net/apps/gophertype/pkg/bundled"
 	"git.kirsle.net/apps/gophertype/pkg/settings"
+	assets "git.kirsle.net/apps/gophertype/pvt-www"
 )

 // SendFile sends a file from bindata or the user root.
@ -18,7 +18,7 @@ func SendFile(w http.ResponseWriter, r *http.Request, path string) {

 	w.Header().Set("Content-Type", mimeType)

-	if b, err := bundled.Asset(path); err == nil {
+	if b, err := assets.Asset(path); err == nil {
 		w.Write(b)
 		return
 	}
--- a/pvt-www/assets_embed.go
+++ b/pvt-www/assets_embed.go
@ -0,0 +1,57 @@
+// Package assets gets us off go-bindata by using Go 1.16 embed support.
+package assets
+
+import (
+	"embed"
+	"io/fs"
+	"strings"
+)
+
+//go:embed *
+var Embedded embed.FS
+
+// AssetDir returns the list of embedded files at the directory name.
+func AssetDir(name string) ([]string, error) {
+	// normalize path separators, for Windows
+	name = strings.ReplaceAll(name, "\\", "/")
+
+	var result []string
+
+	name = strings.TrimPrefix(name, "assets/")
+	files, err := Embedded.ReadDir(name)
+	if err != nil {
+		return result, err
+	}
+
+	for _, file := range files {
+		if file.IsDir() {
+			continue
+		}
+		result = append(result, file.Name())
+	}
+
+	return result, nil
+}
+
+// Asset returns the byte data of an embedded asset.
+func Asset(name string) ([]byte, error) {
+	// normalize path separators, for Windows
+	name = strings.ReplaceAll(name, "\\", "/")
+
+	return Embedded.ReadFile(strings.TrimPrefix(name, "assets/"))
+}
+
+// AssetNames dumps the names of all embedded assets,
+// with their legacy "assets/" prefix from go-bindata.
+func AssetNames() []string {
+	var result []string
+
+	fs.WalkDir(Embedded, ".", func(path string, d fs.DirEntry, err error) error {
+		if d != nil && !d.IsDir() {
+			result = append(result, "assets/"+path)
+		}
+		return nil
+	})
+
+	return result
+}