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use base64;
use google_calendar3::api::{Event, EventAttendee};
use google_calendar3::CalendarHub;
use home;
use hyper;
use hyper_rustls;
use regex::Regex;
use tokio;
use yup_oauth2 as oauth2;
use std::env;
use std::fmt;
use std::fs;
use std::process;
use std::str;
use std::string;
#[derive(Debug)]
enum EventResponseStatus {
Accepted,
Declined,
Tentative,
}
impl fmt::Display for EventResponseStatus {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
EventResponseStatus::Accepted => write!(f, "accepted"),
EventResponseStatus::Declined => write!(f, "declined"),
EventResponseStatus::Tentative => write!(f, "tentative"),
}
}
}
#[derive(Debug)]
struct Eid {
event_id: String,
email: Option<String>,
}
impl Eid {
fn new(event_id: String, email: Option<String>) -> Self {
Eid { event_id, email }
}
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let args: Vec<String> = env::args().collect();
let mut action_opt: Option<EventResponseStatus> = None;
let mut email = false;
let mut event_ids = Vec::new();
for arg in &args[1..] {
match arg.as_ref() {
"-y" | "--yes" =>
action_opt = Some(EventResponseStatus::Accepted),
"-n" | "--no" =>
action_opt = Some(EventResponseStatus::Declined),
"-m" | "--maybe" =>
action_opt = Some(EventResponseStatus::Tentative),
"--email" =>
email = true,
id =>
event_ids.push(id),
}
}
let action = match action_opt {
Some(a) => a,
None => {
eprintln!("error: missing required action argument: --yes | --no | --maybe");
process::exit(exitcode::USAGE);
},
};
if event_ids.is_empty() {
eprintln!("error: missing event ID argument");
process::exit(exitcode::USAGE);
}
for event_id in &event_ids {
rsvp(
&event_id_from_base64(event_id),
&action,
).await;
}
Ok(())
}
async fn rsvp(eid: &Eid, response: &EventResponseStatus) {
let secret = secret_from_file();
let auth = oauth2::InstalledFlowAuthenticator::builder(
secret,
oauth2::InstalledFlowReturnMethod::HTTPRedirect,
)
.persist_tokens_to_disk(
home::home_dir()
.unwrap()
.join(".google-service-cli/google-calendar-rsvp")
)
.build().await.unwrap();
let hub = CalendarHub::new(
hyper::Client::builder()
.build(hyper_rustls::HttpsConnector::with_native_roots()),
auth,
);
let mut event = Event::default();
let mut attendee = EventAttendee::default();
if let Some(email) = &eid.email {
attendee.email = Some(email.to_owned());
} else {
let result = hub.events()
.get("primary", &eid.event_id)
.doit()
.await
.unwrap();
if let Some(attendees) = result.1.attendees {
for a in &attendees {
if let Some(is_me) = a.self_ {
if is_me {
attendee.email = a.email.clone();
break;
}
}
}
}
}
attendee.response_status = Some(response.to_string());
event.attendees = Some(vec![attendee]);
let res = hub.events()
.patch(event, "primary", &eid.event_id)
.doit()
.await
.unwrap();
dbg!(res);
}
fn secret_from_file() -> oauth2::ApplicationSecret {
let f = fs::File::open(
home::home_dir()
.unwrap()
.join(".google-service-cli/calendar3-secret.json"),
).unwrap();
let console_secret: oauth2::ConsoleApplicationSecret = serde_json::from_reader(f).unwrap();
match console_secret.installed {
Some(secret) => secret,
None => todo!(),
}
}
fn event_id_from_base64(event_id: &str) -> Eid {
// Base64-matching regex from Xuanyuanzhiyuan
// (https://stackoverflow.com/users/1076906/xuanyuanzhiyuan) on Stack
// Overflow:
// https://stackoverflow.com/questions/8571501/how-to-check-whether-a-string-is-base64-encoded-or-not/8571649#8571649
let re = Regex::new(
"^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$",
).unwrap();
if !re.is_match(event_id) {
return Eid::new(event_id.to_owned(), None);
}
let decoded = &base64::decode(event_id).unwrap();
let id_email_pair = str::from_utf8(decoded).unwrap();
let values = id_email_pair.split(" ").collect::<Vec<_>>();
let id = values.first().unwrap().to_string();
Eid::new(id, values.last().map(string::ToString::to_string))
}
#[cfg(test)]
mod tests {
use crate::*;
#[test]
fn test_event_id_from_base64_event_id() {
let expected = "1g4j1h67ndq7kddrb2bptp2cua_20210521T120000Z";
let id = event_id_from_base64(expected);
assert_eq!(expected, id);
}
#[test]
fn test_event_id_from_base64_eid() {
let expected = "1g4j1h67ndq7kddrb2bptp2cua";
let encoded = base64::encode(format!("{} rory.mercury@example.com", expected));
let id = event_id_from_base64(&encoded);
assert_eq!(expected, id);
}
}
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