diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | .gitmodules | 3 | ||||
| -rw-r--r-- | LICENSE | 661 | ||||
| -rw-r--r-- | Makefile | 40 | ||||
| -rw-r--r-- | README.md | 2 | ||||
| -rw-r--r-- | config/default.json | 14 | ||||
| -rw-r--r-- | data/.gitignore | 1 | ||||
| -rw-r--r-- | data/static/add.html | 33 | ||||
| l--------- | data/static/libweb.css | 1 | ||||
| -rw-r--r-- | data/templates/index.html | 31 | ||||
| -rw-r--r-- | data/templates/recipe.html | 64 | ||||
| -rw-r--r-- | go.mod | 8 | ||||
| -rw-r--r-- | go.sum | 4 | ||||
| m--------- | libweb | 0 | ||||
| -rw-r--r-- | main.go | 27 | ||||
| -rw-r--r-- | sql/0001_migration.sql | 25 | ||||
| -rw-r--r-- | sql/0002_migration.sql | 25 | ||||
| -rw-r--r-- | systemd/ceres.service | 14 | ||||
| -rw-r--r-- | systemd/ceres.sysusers | 1 | ||||
| -rw-r--r-- | systemd/ceres.tmpfiles | 4 | ||||
| -rw-r--r-- | utils/database.go | 187 | ||||
| -rw-r--r-- | utils/errors.go | 84 | ||||
| -rw-r--r-- | utils/runtime_config.go | 84 | ||||
| -rw-r--r-- | utils/storage.go | 31 | ||||
| -rw-r--r-- | utils/templates.go | 32 | ||||
| -rw-r--r-- | web/handler.go | 228 | ||||
| -rw-r--r-- | web/router.go | 27 |
27 files changed, 1632 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..22d0d82 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +vendor diff --git a/.gitmodules b/.gitmodules new file mode 100644 index 0000000..13669d0 --- /dev/null +++ b/.gitmodules @@ -0,0 +1,3 @@ +[submodule "libweb"] + path = libweb + url = https://cgit.xengineering.eu/libweb @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +our General Public Licenses are intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + + Developers that use our General Public Licenses protect your rights +with two steps: (1) assert copyright on the software, and (2) offer +you this License which gives you legal permission to copy, distribute +and/or modify the software. + + A secondary benefit of defending all users' freedom is that +improvements made in alternate versions of the program, if they +receive widespread use, become available for other developers to +incorporate. Many developers of free software are heartened and +encouraged by the resulting cooperation. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +<https://www.gnu.org/licenses/>. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..391c6ea --- /dev/null +++ b/Makefile @@ -0,0 +1,40 @@ + +DESTDIR="" # leave empty for the current system or provide a fakeroot here +PREFIX="/usr" + +.PHONY: all clean install debug + +all: + # some recommended options for Go building (https://wiki.archlinux.org/title/Go_package_guidelines) + export CGO_CPPFLAGS="${CPPFLAGS}" + export CGO_CFLAGS="${CFLAGS}" + export CGO_CXXFLAGS="${CXXFLAGS}" + export CGO_LDFLAGS="${LDFLAGS}" + export GOFLAGS="-buildmode=pie -trimpath -ldflags=-linkmode=external -mod=readonly -modcacherw" + + mkdir -p build + go build -o build/ceres main.go + +clean: + rm -rf build + +install: all + install -Dm 755 build/ceres $(DESTDIR)$(PREFIX)/bin/ceres + + install -Dm 644 config/default.json $(DESTDIR)/etc/ceres/config.json + + install -Dm 644 data/static/add.html $(DESTDIR)$(PREFIX)/share/ceres/static/add.html + install -Dm 644 data/static/libweb.css $(DESTDIR)$(PREFIX)/share/ceres/static/libweb.css + + install -Dm 644 data/templates/index.html $(DESTDIR)$(PREFIX)/share/ceres/templates/index.html + install -Dm 644 data/templates/recipe.html $(DESTDIR)$(PREFIX)/share/ceres/templates/recipe.html + + install -Dm 644 systemd/ceres.service $(DESTDIR)$(PREFIX)/lib/systemd/system/ceres.service + install -Dm 644 systemd/ceres.sysusers $(DESTDIR)$(PREFIX)/lib/sysusers.d/ceres.conf + install -Dm 644 systemd/ceres.tmpfiles $(DESTDIR)$(PREFIX)/lib/tmpfiles.d/ceres.conf + install -Dm 644 sql/0001_migration.sql $(DESTDIR)$(PREFIX)/share/ceres/migrations/0001_migration.sql + install -Dm 644 sql/0002_migration.sql $(DESTDIR)$(PREFIX)/share/ceres/migrations/0002_migration.sql + +debug: + go run main.go -d -c config/default.json + diff --git a/README.md b/README.md new file mode 100644 index 0000000..6d0c710 --- /dev/null +++ b/README.md @@ -0,0 +1,2 @@ + +# ceres diff --git a/config/default.json b/config/default.json new file mode 100644 index 0000000..076d672 --- /dev/null +++ b/config/default.json @@ -0,0 +1,14 @@ +{ + "http":{ + "bind_host":"127.0.0.1", + "bind_port":"8080", + "static":"/usr/share/ceres/static", + "templates":"/usr/share/ceres/templates", + "storage":"/var/lib/ceres" + }, + "database":{ + "socket":"/run/mysqld/mysqld.sock", + "user":"ceres", + "database":"ceres" + } +} diff --git a/data/.gitignore b/data/.gitignore new file mode 100644 index 0000000..fa780e2 --- /dev/null +++ b/data/.gitignore @@ -0,0 +1 @@ +storage diff --git a/data/static/add.html b/data/static/add.html new file mode 100644 index 0000000..ed02811 --- /dev/null +++ b/data/static/add.html @@ -0,0 +1,33 @@ +<!DOCTYPE html> + +<html> + + <head> + + <title>Recipes</title> + + <meta charset="utf-8"/> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <link rel="stylesheet" href="./static/libweb.css" type="text/css"> + + </head> + + <body> + + <main> + + <h1>Add a recipe</h1> + + <form action="/add_recipes" method="post"> + <label for="custom_title">Title:</label><br> + <input style="border: 1px solid;" type="text" id="custom_title" name="title"><br> + <label for="custom_link">Link (optional):</label><br> + <input style="border: 1px solid;" type="text" id="custom_link" name="url"><br> + <button class="card-last-item" type="submit">add</button> + </form> + + </main> + + </body> + +</html> diff --git a/data/static/libweb.css b/data/static/libweb.css new file mode 120000 index 0000000..efe201e --- /dev/null +++ b/data/static/libweb.css @@ -0,0 +1 @@ +../../libweb/libweb.css
\ No newline at end of file diff --git a/data/templates/index.html b/data/templates/index.html new file mode 100644 index 0000000..f216ed4 --- /dev/null +++ b/data/templates/index.html @@ -0,0 +1,31 @@ +<!DOCTYPE html> + +<html> + + <head> + + <title>Recipes</title> + + <meta charset="utf-8"/> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <link rel="stylesheet" href="./static/libweb.css" type="text/css"> + + </head> + + <body> + + <main> + <h1>Recipes</h1> + <button><a href="./add_recipes">add recipe</a></button> + <p>Here are the available recipes 😋🍳🍔🍕🥘</p> + {{range .}} + <a href="./recipe?id={{.Id}}"> + <div class="card"> + <h5 class="card-first-item" class="card-last-item">{{.Title}}</h5> + </div> + </a>{{end}} + </main> + + </body> + +</html> diff --git a/data/templates/recipe.html b/data/templates/recipe.html new file mode 100644 index 0000000..fcfdf67 --- /dev/null +++ b/data/templates/recipe.html @@ -0,0 +1,64 @@ +<!DOCTYPE html> + +<html> + + <head> + + <title>Recipes</title> + + <meta charset="utf-8"/> + <meta name="viewport" content="width=device-width, initial-scale=1.0"> + <link rel="stylesheet" href="../../../static/libweb.css" type="text/css"> + + </head> + + <body> + + <main> + <h1>{{.Title}}</h1> + <img src="./recipe/image?id={{.Id}}" alt="Recipe image">{{if ne .UpstreamUrl ""}} + <p><a href="{{.UpstreamUrl}}">Link to recipe</a></p>{{end}} + <h2>Recipe description</h2> + <button id="editbtn" style="margin-top:20px;margin-bottom:20px;display:block" onclick=startEditMode()>edit</button> + <button id="cancelbtn" style="margin-top:20px;margin-bottom:20px;display:none" onclick=cancelEditMode()>abort</button> + <button id="savebtn" style="margin-top:20px;margin-bottom:20px;display:none" onclick=saveDescriptionMarkdown()>save</button> + <pre id="description_md" style="display:none;" contenteditable="true">{{.DescriptionMarkdown}}</pre> + <div id="rendered_description_md" style="display:block;"> + {{.RenderedDescriptionMarkdown}} + </div> + </main> + + <script> + var editbtn = document.getElementById("editbtn"); + var cancelbtn = document.getElementById("cancelbtn"); + var savebtn = document.getElementById("savebtn"); + var description_md = document.getElementById("description_md"); + var rendered_description_md = document.getElementById("rendered_description_md"); + + function startEditMode() { + editbtn.style.display = "none"; + rendered_description_md.style.display = "none"; + cancelbtn.style.display = "block"; + savebtn.style.display = "block"; + description_md.style.display = "block"; + } + + function cancelEditMode() { + window.location.reload(true); + } + + function saveDescriptionMarkdown() { + var xhttp = new XMLHttpRequest(); + xhttp.onreadystatechange = function() { + if (this.readyState == 4) { + window.location.reload(true); + } + } + xhttp.open("POST", window.location.href, true); + xhttp.send(description_md.innerHTML.replaceAll("<br>", "\n")); + } + </script> + + </body> + +</html> @@ -0,0 +1,8 @@ +module xengineering.eu/ceres + +go 1.16 + +require ( + github.com/go-sql-driver/mysql v1.6.0 + github.com/yuin/goldmark v1.4.13 +) @@ -0,0 +1,4 @@ +github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE= +github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg= +github.com/yuin/goldmark v1.4.13 h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE= +github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY= diff --git a/libweb b/libweb new file mode 160000 +Subproject d1e432e4bd53d5214fc2ac1fbb01393bf9c425f @@ -0,0 +1,27 @@ + +package main + +import ( + "log" + + "xengineering.eu/ceres/utils" + "xengineering.eu/ceres/web" +) + +func main() { + + // disable log timestamp because systemd takes care of that + log.SetFlags(0) + + // read all sources of runtime configuration (e.g. CLI flags and config file) + config := utils.GetRuntimeConfig() + + // print start message + log.Printf("Starting ceres with config file '%s'\n", config.Path) + + // initialize database + db := utils.InitDatabase(config.Database) + + // start web server + web.RunServer(config.Http, &db) +} diff --git a/sql/0001_migration.sql b/sql/0001_migration.sql new file mode 100644 index 0000000..b04a754 --- /dev/null +++ b/sql/0001_migration.sql @@ -0,0 +1,25 @@ + +-------------------------------------------------------------------------------- + +-- This migration script adds the ceres database and user and sets +-- permissions. + +-- Run this migration via `sudo mariadb -u root < 0001_migration.sql`. Mind +-- that you also have to create the ceres Linux user. This is possibly done +-- by the systemd *.sysusers file. + +-- create database for ceres, add ceres user and set privileges +CREATE DATABASE IF NOT EXISTS ceres; +CREATE USER IF NOT EXISTS 'ceres'@'localhost' IDENTIFIED VIA unix_socket; +GRANT ALL PRIVILEGES on ceres.* to 'ceres'@'localhost'; +FLUSH PRIVILEGES; + +-- select correct database for the rest of this script +USE ceres; + +-- create meta table and set database schema version +CREATE TABLE IF NOT EXISTS meta ( + identifier varchar(80) PRIMARY KEY NOT NULL UNIQUE, + value varchar(80) NOT NULL +); +INSERT INTO meta (identifier,value) VALUES ('version', '1'); diff --git a/sql/0002_migration.sql b/sql/0002_migration.sql new file mode 100644 index 0000000..7c99616 --- /dev/null +++ b/sql/0002_migration.sql @@ -0,0 +1,25 @@ + +-------------------------------------------------------------------------------- + +-- This migration creates the initial version of the database layout. + +-- Run this command as Linux user `ceres` with this command: +-- `mariadb < 0002_migration.sql`. + +-- set database for this script +USE ceres; + +-- create recipe table +CREATE TABLE IF NOT EXISTS recipes ( + id INT UNSIGNED PRIMARY KEY NOT NULL AUTO_INCREMENT, + title varchar(80) NOT NULL DEFAULT '(no title)', + upstream_url varchar(200) NOT NULL DEFAULT '', + description_markdown text NOT NULL DEFAULT '' +); + +-- update database schema version +UPDATE meta +SET + value='2' +WHERE + identifier='version'; diff --git a/systemd/ceres.service b/systemd/ceres.service new file mode 100644 index 0000000..12b63c9 --- /dev/null +++ b/systemd/ceres.service @@ -0,0 +1,14 @@ + +[Unit] +Description=Recipe server for your favorite dishes +After=network.target +After=mariadb.service + +[Service] +User=ceres +Group=ceres +ExecStart=/usr/bin/ceres + +[Install] +WantedBy=multi-user.target + diff --git a/systemd/ceres.sysusers b/systemd/ceres.sysusers new file mode 100644 index 0000000..e269688 --- /dev/null +++ b/systemd/ceres.sysusers @@ -0,0 +1 @@ +u ceres - "ceres daemon user" - /bin/bash diff --git a/systemd/ceres.tmpfiles b/systemd/ceres.tmpfiles new file mode 100644 index 0000000..1c3101c --- /dev/null +++ b/systemd/ceres.tmpfiles @@ -0,0 +1,4 @@ +d /var/lib/ceres 0750 +d /var/lib/ceres/recipes 0750 +d /var/lib/ceres/recipes/image 0750 +Z /var/lib/ceres - ceres ceres diff --git a/utils/database.go b/utils/database.go new file mode 100644 index 0000000..b8a6941 --- /dev/null +++ b/utils/database.go @@ -0,0 +1,187 @@ + +package utils + +import ( + "log" + "fmt" + "path/filepath" + "io" + "os" + "os/signal" + "os/user" + "os/exec" + "strconv" + "syscall" + "database/sql" + + _ "github.com/go-sql-driver/mysql" +) + +const databaseSchemaVersion int = 2 // this defines the needed version for the + // executable + +type Database struct { + config DatabaseConfig + target string + Backend *sql.DB +} + +func InitDatabase(config DatabaseConfig) Database { + + db := NewDatabase(config) + db.Connect() + db.Ping() + db.Migrate(config.Debug) + + // allow graceful shutdown + var listener = make(chan os.Signal) + signal.Notify(listener, syscall.SIGTERM) + signal.Notify(listener, syscall.SIGINT) + go func() { + signal := <-listener + log.Printf("\nGot signal '%+v'. Shutting down ...\n", signal) + db.Cleanup() + os.Exit(0) // TODO this does not belong to a database - write utils file 'shutdown.go' + }() + + return db +} + +func NewDatabase(config DatabaseConfig) Database { + + db := Database{} + + db.config = config + var username string + if config.Debug { + user_ptr,err := user.Current() + if err != nil { + log.Fatal(err) + } + username = user_ptr.Username + } else { + username = config.User + } + db.target = fmt.Sprintf("%s@unix(%s)/%s", username, config.Socket, config.Database) + + return db +} + +func (db *Database) Connect() { + var err error + db.Backend,err = sql.Open("mysql", db.target) + if err != nil { + log.Fatal(err) + } + log.Printf("Connected to database '%s'\n", db.target) +} + +func (db *Database) Ping() { + err := db.Backend.Ping() + if err != nil { + log.Fatal(err) + } else { + log.Println("Database is responding") + } +} + +func (db *Database) Migrate(debug bool) { + + // get directory with SQL migration scripts + var dir string + if debug { + dir = "./sql" + } else { + dir = "/usr/share/ceres/migrations/" + } + + const t = databaseSchemaVersion // targeted database schema version + + for { + v := db.SchemaVersion() // read schema version from DB table + + // handle current database schema which is newer than targeted one + if v > t { + log.Fatalf( + "Current database schema version is %d but newest is %d!", v, t) + } + + // break if targeted version is already reached + if v == t { + break + } + + // execute migration + log.Printf("Starting database schema migration to version %d.\n", v+1) + path := filepath.Join(dir, fmt.Sprintf("%04d_migration.sql", v+1)) + RunSql(path) + log.Printf("Finished database schema migration to version %d.\n", v+1) + } +} + +func RunSql(path string) { + + script, err := os.Open(path) + if err != nil { + log.Fatalf("Could not open SQL script '%s'!\n", path) + } + + cmd := exec.Command("mariadb") + stdin, err := cmd.StdinPipe() + if err != nil { + log.Fatalf("Could not open stdin of mariadb process!\n%v", err) + } + + err = cmd.Start() + if err != nil { + log.Fatalf("Could not start mariadb process!\n%v", err) + } + io.Copy(stdin, script) + stdin.Close() + + err = cmd.Wait() + if err != nil { + log.Fatalf("Failed to wait for SQL script to finish!\n%v", err) + } +} + +func (db *Database) SchemaVersion() int { + + // ask database for schema version + cmd := "SELECT value FROM meta WHERE (identifier='version');" + rows, err := db.Backend.Query(cmd) + + // handle missing meta table + if err != nil { + log.Fatal(err) + } + + // handle successful schema version query + defer rows.Close() + rows.Next() + var version string + err = rows.Scan(&version) + + // handle missing version field in meta table + if err != nil { + log.Fatal(err) + } + + // convert to integer and handle error + v, err := strconv.Atoi(version) + if err != nil { + log.Fatalf("Could not convert database schema version '%s' to int.\n", + version) + } + + return v +} + +func (db *Database) Cleanup() { + err := db.Backend.Close() + if err != nil { + log.Println("Could not close database connection") + } else { + log.Println("Closed database connection") + } +} diff --git a/utils/errors.go b/utils/errors.go new file mode 100644 index 0000000..757d2a1 --- /dev/null +++ b/utils/errors.go @@ -0,0 +1,84 @@ + +package utils + +import ( + "fmt" + "log" + "net/http" +) + +func Err(w http.ResponseWriter, code int, a ...interface{}) { + + var msg string // format string for error message + var hc int // HTTP error code + + var prefix string = fmt.Sprintf("Error %d - ", code) + + // ATTENTION: the used error codes in this switch statements should be + // stable. Do not change them, just append to the list! + switch code { + + case 1: + msg = "Failed to load recipes from database." + hc = http.StatusInternalServerError + + case 2: + msg = "Could not parse recipe from database request." + hc = http.StatusInternalServerError + + case 3: + msg = "Exactly 1 'id' URL parameter expected but %d provided." + hc = http.StatusBadRequest + + case 4: + msg = "'id' URL parameter '%s' doas not match the regex '%s'." + hc = http.StatusBadRequest + + case 5: + msg = "Received error from database: '%s'." + hc = http.StatusInternalServerError + + case 6: + msg = "Expected exactly 1 recipe from database but got %d." + hc = http.StatusInternalServerError + + // deprecated + case 7: + msg = "Exactly 1 'type' URL parameter expected but %d provided." + hc = http.StatusBadRequest + + case 8: + msg = "Form data does not contain recipe URL (key is '%s')." + hc = http.StatusBadRequest + + case 9: + msg = "Could not add recipe: '%s'." + hc = http.StatusInternalServerError + + case 10: + msg = "Expected exactly 1 recipe URL in '%s' but got %d (regex is '%s')." + hc = http.StatusBadRequest + + case 11: + msg = "Could not get recipe ID from database: '%s'." + hc = http.StatusInternalServerError + + // deprecated + case 12: + msg = "Given recipe type '%s' is unknown." + hc = http.StatusBadRequest + + default: + msg = "An unknown error occured." + hc = http.StatusInternalServerError + + } + + // format full error message + final := fmt.Sprintf(prefix + msg, a...) + + // send message to log and user + log.Println(final) + http.Error(w, final, hc) + +} diff --git a/utils/runtime_config.go b/utils/runtime_config.go new file mode 100644 index 0000000..42170f6 --- /dev/null +++ b/utils/runtime_config.go @@ -0,0 +1,84 @@ + +package utils + +import ( + "fmt" + "log" + "flag" + "os" + "io/ioutil" + "encoding/json" +) + +type RuntimeConfig struct { + Path string + Debug bool + Http HttpConfig `json:"http"` + Database DatabaseConfig `json:"database"` +} + +type HttpConfig struct { + Host string `json:"bind_host"` + Port string `json:"bind_port"` + Static string `json:"static"` + Templates string `json:"templates"` + Storage string `json:"storage"` +} + +type DatabaseConfig struct { + Socket string `json:"socket"` + User string `json:"user"` + Database string `json:"database"` + Debug bool +} + +func GetRuntimeConfig() RuntimeConfig { + + // init empty return value + config := RuntimeConfig{} + + // read command line flags + flag.StringVar(&config.Path, "c", "/etc/ceres/config.json", "Path to ceres configuration file") + flag.BoolVar(&config.Debug, "d", false, "Use this flag if you are in a development environment") + flag.Parse() + + // open config file + configFile, err := os.Open(config.Path) + defer configFile.Close() + if err != nil { + log.Fatalf("Could not open configuration file %s", config.Path) + } + + // read byte content + configData, err := ioutil.ReadAll(configFile) + if err != nil { + log.Fatalf("Could not read configuration file %s", config.Path) + } + + // parse content to config structs + err = json.Unmarshal(configData, &config) + if err != nil { + log.Fatalf("Could not parse configuration file %s", config.Path) + } + + // override defaults if in debugging mode + if config.Debug { + config.Http.Static = "./data/static" + config.Http.Templates = "./data/templates" + config.Http.Storage = "./data/storage" + } + + // copy debug value + config.Database.Debug = config.Debug + + // print config if in debug mode + if config.Debug { + configuration,err := json.MarshalIndent(config, "", " ") + if err != nil { + log.Fatal(err) + } + fmt.Print("Used config: " + string(configuration) + "\n") + } + + return config +} diff --git a/utils/storage.go b/utils/storage.go new file mode 100644 index 0000000..ee5b7bf --- /dev/null +++ b/utils/storage.go @@ -0,0 +1,31 @@ + +package utils + +import ( + "log" + "net/http" + "io/ioutil" + "path/filepath" +) + +func ServeStorage(w http.ResponseWriter, r *http.Request, storage string, path string) { + + // generate absolute, cleaned path of ressource + path = filepath.Join(storage, path) + path,err := filepath.Abs(path) + if err != nil { + log.Print(err) + http.Error(w, http.StatusText(400), 400) + return + } + + // TODO check if path is still in storage folder + + // serve the file if nothing has been wrong + http.ServeFile(w, r, path) +} + +func SaveStorageFile(data *[]byte, storage string, path string) error { + fullpath := filepath.Join(storage, path) + return ioutil.WriteFile(fullpath, *data, 0644) +} diff --git a/utils/templates.go b/utils/templates.go new file mode 100644 index 0000000..00a8eb2 --- /dev/null +++ b/utils/templates.go @@ -0,0 +1,32 @@ + +package utils + +import ( + "log" + "net/http" + "io/ioutil" + "text/template" // FIXME switch to html/template for security reasons + // and make a workaround for rendered Markdown insertion +) + +func ServeTemplate(w http.ResponseWriter, name string, path string, data interface{}) { + + templateFile,err := ioutil.ReadFile(path) + if err != nil { + log.Print(err) + http.Error(w, http.StatusText(404), 404) + return + } + tmpl,err := template.New(name).Parse(string(templateFile)) + if err != nil { + log.Print(err) + http.Error(w, http.StatusText(404), 404) + return + } + err = tmpl.Execute(w, data) + if err != nil { + log.Print(err) + http.Error(w, http.StatusText(404), 404) + return + } +} diff --git a/web/handler.go b/web/handler.go new file mode 100644 index 0000000..cab38ed --- /dev/null +++ b/web/handler.go @@ -0,0 +1,228 @@ + +package web + +import ( + "bytes" + "fmt" + "regexp" + "log" + "io/ioutil" + "net/http" + "path/filepath" + + "xengineering.eu/ceres/utils" + + "github.com/yuin/goldmark" +) + +const ( + VALID_ID_REGEX = `^[0-9]+$` +) + +func static(filename string, staticRoot string) func(http.ResponseWriter, *http.Request) { + + return func(w http.ResponseWriter, r *http.Request) { + path := filepath.Join(staticRoot, filename) + log.Printf("Trying to serve: %s\n", path) + http.ServeFile(w, r, path) + } +} + +func index(db *utils.Database, templateRoot string) func(http.ResponseWriter, *http.Request) { + + return func(w http.ResponseWriter, r *http.Request) { + + // get data from database + cmd := "SELECT id,title FROM recipes ORDER BY title;" + log.Printf("Query: %s", cmd) + rows, err := db.Backend.Query(cmd) + if err != nil { + utils.Err(w, 1) + return + } + defer rows.Close() + + // prepare data store + type Element struct { + Id string + Title string + } + elements := make([]Element, 0) + + // scan database rows to data store + for rows.Next() { + var element Element + err := rows.Scan(&element.Id, &element.Title) + if err != nil { + utils.Err(w, 2) + return + } else { + elements = append(elements, element) + } + } + + // render and return template + path := filepath.Join(templateRoot, "index.html") + utils.ServeTemplate(w, "index", path, elements) + } +} + +func recipe(db *utils.Database, templateRoot string) func(http.ResponseWriter, *http.Request) { + + return func(w http.ResponseWriter, r *http.Request) { + + // get id from URL parameters + ids := r.URL.Query()["id"] + if len(ids) != 1 { + utils.Err(w, 3, len(ids)) + return + } + idStr := ids[0] + + // validate id + idRegex := regexp.MustCompile(VALID_ID_REGEX) + if !(idRegex.MatchString(idStr)) { + utils.Err(w, 4, idStr, VALID_ID_REGEX) + return + } + + if r.Method == "GET" { + + // get data from database + cmd := fmt.Sprintf("SELECT title,upstream_url,description_markdown FROM recipes WHERE (id='%s');", idStr) + log.Printf("Query: %s", cmd) + rows, err := db.Backend.Query(cmd) + if err != nil { + utils.Err(w, 5, err) + return + } + defer rows.Close() + + // prepare data store + type Element struct { + Id string + Title string + UpstreamUrl string + DescriptionMarkdown string + RenderedDescriptionMarkdown string + } + elements := make([]Element, 0) + + // scan database rows to data store + for rows.Next() { + var element Element + element.Id = idStr + err := rows.Scan(&element.Title, &element.UpstreamUrl, &element.DescriptionMarkdown) + if err != nil { + utils.Err(w, 2) + return + } else { + elements = append(elements, element) + } + } + + // check result + if len(elements) != 1 { + utils.Err(w, 6, len(elements)) + return + } + + // render markdown + var buf bytes.Buffer + goldmark.Convert([]byte(elements[0].DescriptionMarkdown), &buf) + elements[0].RenderedDescriptionMarkdown = buf.String() + + // render and return template + path := filepath.Join(templateRoot, "recipe.html") + utils.ServeTemplate(w, "recipe", path, elements[0]) + } + + if r.Method == "POST" { + + // read request body + buffer,_ := ioutil.ReadAll(r.Body) // FIXME error handling + body := string(buffer) + updateRecipe(db, body, idStr) + + } + } +} + +func updateRecipe(db *utils.Database, body string, idStr string) { + + // execute SQL UPDATE + _,_ = db.Backend.Exec(` + UPDATE + recipes + SET + description_markdown=? + WHERE + (id=?); + `, + body, idStr, + ) // FIXME error handling + + return +} + +func image(storageRoot string) func(http.ResponseWriter, *http.Request) { + + return func(w http.ResponseWriter, r *http.Request) { + + // get ID + ids := r.URL.Query()["id"] + if len(ids) != 1 { + utils.Err(w, 3, len(ids)) + return + } + idStr := ids[0] + + // validate ID + idRegex := regexp.MustCompile(VALID_ID_REGEX) + if !idRegex.MatchString(idStr) { + utils.Err(w, 4, idStr, VALID_ID_REGEX) + return + } + + // serve image + path := fmt.Sprintf("recipes/image/%s.jpg", idStr) + utils.ServeStorage(w, r, storageRoot, path) + } +} + +func add_recipes(db *utils.Database, storageRoot string, staticRoot string) func(http.ResponseWriter, *http.Request) { + + return func(w http.ResponseWriter, r *http.Request) { + + if r.Method == "GET" { + filename := "add.html" + path := filepath.Join(staticRoot, filename) + log.Printf("Trying to serve: %s", path) + http.ServeFile(w, r, path) + return + } + + if r.Method == "POST" { + url := r.FormValue("url") + title := r.FormValue("title") + + cmd := fmt.Sprintf("INSERT INTO recipes (title,upstream_url) VALUES ('%s', '%s')", title, url) + log.Println(cmd) + res,err := db.Backend.Exec(cmd) + if err != nil { + utils.Err(w, 9, err) + return + } + id,err := res.LastInsertId() + if err != nil { + utils.Err(w, 11, err) + return + } else { + log.Println("Added custom recipe.") + redirect := fmt.Sprintf("/recipe?id=%d", id) + http.Redirect(w, r, redirect, 303) + return + } + } + } +} diff --git a/web/router.go b/web/router.go new file mode 100644 index 0000000..b26dc88 --- /dev/null +++ b/web/router.go @@ -0,0 +1,27 @@ + +package web + +import ( + "log" + "net/http" + + "xengineering.eu/ceres/utils" +) + +func RunServer(config utils.HttpConfig, db *utils.Database) { + + http.HandleFunc("/", index(db, config.Templates)) + + http.HandleFunc("/recipe", recipe(db, config.Templates)) + + http.HandleFunc("/recipe/image", image(config.Storage)) + + http.HandleFunc("/add_recipes", add_recipes(db, config.Storage, config.Static)) + + http.HandleFunc("/static/libweb.css", static("libweb.css", config.Static)) + http.HandleFunc("/favicon.ico", static("favicon.ico", config.Static)) + + address := config.Host + ":" + config.Port + log.Println("Binding to 'http://" + address) + log.Fatal(http.ListenAndServe(address, nil)) +} |