add utility program

This can be used to write configs in dhall (instead of plain json), combined
with some input validation and (optionally) automatic encryption via the age
rust crate.

4 files changed, 2366 insertions, 0 deletions

diff --git a/utils/.gitignore b/utils/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/utils/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/utils/Cargo.lock b/utils/Cargo.lock
new file mode 100644
index 0000000..d060ca7
--- /dev/null
+++ b/utils/Cargo.lock
@@ -0,0 +1,2247 @@
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diff --git a/utils/Cargo.toml b/utils/Cargo.toml
new file mode 100644
index 0000000..566d604
--- /dev/null
+++ b/utils/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "rust"
+version = "0.1.0"
+authors = ["stuebinm <stuebinm@disroot.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = [ "derive" ] }
+serde_dhall = "0.10.0"
+serde_json = "1.0.64"
+age = "0.5.1"
+structopt = "0.3.21"
+secrecy = "0.7.0"
diff --git a/utils/src/main.rs b/utils/src/main.rs
new file mode 100644
index 0000000..d49a3d7
--- /dev/null
+++ b/utils/src/main.rs
@@ -0,0 +1,103 @@
+use serde::{Deserialize, Serialize};
+use serde_dhall::StaticType;
+use serde_json as json;
+
+use std::fs;
+use std::io::Write;
+
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+use age::x25519::Recipient;
+
+#[derive(Deserialize, Serialize, StaticType, Debug)]
+struct Survey {
+    title: String,
+    description: String,
+    questions: Vec<Question>,
+    pubkey: Option<String>
+}
+
+#[derive(Deserialize, Serialize, StaticType, Debug)]
+struct Question {
+    question: String,
+    name: String,
+    space: AnswerSpace,
+}
+
+#[derive(Deserialize, Serialize, StaticType, Debug)]
+enum AnswerSpace {
+    Single(Vec<String>),
+    Multiple(Vec<String>),
+    YesOrNo,
+    Freeform(String),
+}
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "basic")]
+struct Options {
+    /// a dhall configuration file that describes a survey
+    #[structopt(long, short, parse(from_os_str))]
+    config_file: PathBuf,
+    /// encrypt the survey with the given password (not yet implemented)
+    #[structopt(long, short)]
+    password: Option<secrecy::Secret<String>>,
+}
+
+fn main () {
+    let opt = Options::from_args();
+
+    let config_file = std::fs::read_to_string(opt.config_file).unwrap();
+
+    // hacky way to get a "prelude" in dhall which doesn't have to be
+    // imported: just wrap our input code into a dhall "let"-statement.
+    // Probably doesn't scale very vell, though ...
+    let code = format!(
+        "let Question = {} \nlet Answers = {} \nin {}",
+        Question::static_type(),
+        AnswerSpace::static_type(),
+        config_file
+    );
+    match serde_dhall::from_str(&code)
+        .static_type_annotation()
+        .parse::<Survey>()
+    {
+        Err(e) => {
+            eprintln!("There is an error in your dhall code!\n{}", e);
+            std::process::exit(1);
+        },
+        Ok(data) => {
+            let json = json::to_string(&data).unwrap();
+
+            // if a public key is given to encrypt the survey, ad-hoc typecheck it
+            // (not sure if the dhall crate allows defining custom types which are
+            // opaque to dhall ...)
+            match data.pubkey {
+                Some (key) => key.parse::<Recipient>().is_err(),
+                None => false
+            }.then(|| {
+                println!("field pubkey is not a valid public key, aborting ...");
+                std::process::exit(1);
+            });
+
+
+            // out here to avoid borrowing issues — if it were in the password
+            // branch below, it would go out of scope at its end, since .as_slice()
+            // just borrows its argument
+            let mut encrypted = vec![];
+            // are we restricting access to the survey? if so, encrypt it with
+            // the password as passphrase.
+            let outdata = match opt.password {
+                None => json.as_bytes(),
+                Some(password) => {
+                    let encryptor = age::Encryptor::with_user_passphrase(password);
+                    let mut writer = encryptor.wrap_output(&mut encrypted).unwrap();
+                    writer.write_all(&json.as_bytes()).unwrap();
+                    writer.finish().unwrap();
+                    encrypted.as_slice()
+                }
+            };
+            fs::write("outfile", outdata).expect("cannot write to outfile!");
+        }
+    }
+}