docs: Add READMEs

Signed-off-by: Julien Riou <julien@riou.xyz>

README.md

@@ -1,3 +1,53 @@
 # Coller
 
-Simple self-contained pastebin solution.
+Simple self-contained pastebin solution written in Go.
+
+# Description
+
+Coller is a set a binaries:
+- **collerd**: HTTP server to handle note management
+- **coller**: CLI to create notes
+- **copier**: CLI to download and decrypt notes (client-side decryption)
+
+# Installation
+
+## From source code
+
+Requires [Go](https://go.dev/dl/).
+
+```
+git clone https://git.riou.xyz/jriou/coller.git
+cd coller
+make
+sudo cp -p bin/* /usr/local/bin/
+```
+
+## Docker
+
+```
+git clone https://git.riou.xyz/jriou/coller.git
+cd coller
+docker build -t coller:latest .
+docker run --network host --rm --name collerd -p 8080:8080 coller:latest
+```
+
+Then go to http://localhost:8080 (website).
+
+## Ansible
+
+See [ansible-role-coller](https://git.riou.xyz/jriou/ansible-role-coller).
+
+
+# Usage and configuration
+
+* [collerd](src/cmd/collerd/README.md)
+* [coller](src/cmd/coller/README.md)
+* [copier](src/cmd/copier/README.md)
+
+# Contributions
+
+Contributions are welcomed! Feel free to provide unit tests when possible. Lint your code with `go fmt`. If you don't feel confident enough to contribute, feel free to open an issue to describe the feature you would like to see implemented or the problem you are facing.
+
+# License
+
+See [LICENSE](LICENSE).

src/cmd/coller/README.md

@@ -0,0 +1,42 @@
+# coller
+
+CLI to create notes.
+
+# Usage
+
+```
+coller -help
+```
+
+# Examples
+
+Create from clipboard:
+
+```
+coller
+```
+
+Create from file:
+
+```
+coller -file filename.txt
+```
+
+Provide password for encryption:
+
+```
+coller -ask-password
+coller -password PASSWORD
+```
+
+Create public note:
+
+```
+coller -no-password
+```
+
+Return the copier command to use client-side decryption instead of the URL:
+
+```
+coller -copier
+```

src/cmd/collerd/README.md

@@ -0,0 +1,31 @@
+# collerd
+
+Server to manage notes:
+* Website
+* API
+* Database management
+
+## Usage
+
+```
+collerd -help
+```
+
+## Configuration
+
+The file format is **JSON**:
+
+* **title** (string): Title of the website
+* **database_type** (string): Type of the database (default "sqlite", "postgres" also supported)
+* **database_dsn** (string): Connection string for the database (default "collerd.db")
+* **id_length** (int): Number of characters for note identifiers (default 5)
+* **password_length** (int): Number of characters for generated passwords (default 16)
+* **expiration_interval** (int): Number of seconds to wait between two expiration runs
+* **listen_address** (string): Address to listen for the web server (default "127.0.0.1")
+* **listen_port** (int): Port to listen for the web server (default 8080)
+* **expirations** ([]int): List of supported expiration times in seconds (default 300, 86400, 604800, 18144000)
+* **expiration** (int): Default expiration time in seconds
+* **max_upload_size** (int): Maximum number of bytes received by the server for notes (the base64 encoding may use more space than the real size of the note)
+* **show_version** (bool): Show version on the website
+
+The configuration file is not required but the service might not be exposed to the public.

src/cmd/copier/README.md

@@ -0,0 +1,16 @@
+# copier
+
+CLI to download and decrypt notes from the client.
+
+# Usage
+
+```
+copier -help
+```
+
+# Examples
+
+```
+copier -password PASSWORD URL
+copier -w URL
+```

src/server/db.go

@@ -35,8 +35,10 @@ func NewDatabase(logger *slog.Logger, config *Config) (d *Database, err error) {
 	switch config.DatabaseType {
 	case "postgres":
 		db, err = gorm.Open(postgres.New(postgres.Config{DSN: config.DatabaseDsn}), gconfig)
-	default:
+	case "sqlite":
 		db, err = gorm.Open(sqlite.Open(config.DatabaseDsn), gconfig)
+	default:
+		return nil, fmt.Errorf("database type '%s' not supported", config.DatabaseType)
 	}
 	if err != nil {
 		return nil, err