Captcha based on SVG.
cargo add biosvg
rust
let (answer, svg) = BiosvgBuilder::new()
.length(4)
.difficulty(6)
.colors(vec![
"#0078D6".to_string(),
"#aa3333".to_string(),
"#f08012".to_string(),
"#33aa00".to_string(),
"#aa33aa".to_string(),
])
.build()
.unwrap();
println!("answer: {}", answer);
println!("svg: {}", svg);