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+dev: + cargo watch -x run diff --git a/README.md b/README.md new file mode 100644 index 0000000..69ff9f2 --- /dev/null +++ b/README.md @@ -0,0 +1,32 @@ +# Schedj + +An AT Protocol based app for scheduling events. + +## Backend + +Data needs to be stored on a backend for Schedj to work properly - it cannot be entirely on-protocol due to the sensitive nature of connecting to calendars and exposing scheduled meetings. This may change with permissioned data. + +## Lexicons + +### Records + +- `com.schedj.actor.profile` - the user's profile details + - `displayName`: the user's display name + - `createdAt`: the date and time the profile was created + - `description`: the user's profile description +- `com.schedj.meetingType` - configured meeting types for the user + +### API + +- `com.schedj.book` - book an event +- `com.schedj.getAvailability` - get a user’s availability + +## Calendar providers + +The provider crates implement `calendar-provider::CalendarProvider` using `reqwest` for HTTP, `serde` for JSON payloads, and `thiserror` for error types. They do not read environment variables directly; pass credentials and IDs to `::new(...)` from the application configuration layer. + +- CalDAV: `CalDavProvider::new(client, calendar_url, username, password)` +- Google Calendar: `GoogleCalendarProvider::new(client, access_token, calendar_id)` +- Microsoft Graph: `MicrosoftCalendarProvider::new(client, access_token, schedule_id)` + +Optional settings such as lookahead days, slot minutes, booking summary, API base URL, Microsoft user ID, and Microsoft calendar ID are configured with builder methods. diff --git a/crates/calendar-provider/Cargo.toml b/crates/calendar-provider/Cargo.toml new file mode 100644 index 0000000..fd9eb72 --- /dev/null +++ b/crates/calendar-provider/Cargo.toml @@ -0,0 +1,7 @@ +[package] +name = "calendar-provider" +version = "0.1.0" +edition = "2024" + +[dependencies] +chrono = "0.4.45" diff --git a/crates/calendar-provider/src/lib.rs b/crates/calendar-provider/src/lib.rs new file mode 100644 index 0000000..a0c565e --- /dev/null +++ b/crates/calendar-provider/src/lib.rs @@ -0,0 +1,133 @@ +//! Calendar provider trait. Any calendar provider (CalDAV, Google, etc) can implement +//! this trait and then be used to provide availability and write calendar events. + +use chrono::{DateTime, Duration, Utc}; +use std::error::Error; +use std::future::Future; + +#[derive(Clone, Debug, PartialEq, Eq)] +pub struct AvailabilitySlot { + pub start: DateTime, + pub end: DateTime, +} + +#[derive(Clone, Debug, Default, PartialEq, Eq)] +pub struct Availability { + pub slots: Vec, +} + +#[derive(Clone, Debug, PartialEq, Eq)] +pub struct BookingRequest { + pub from: DateTime, + pub to: DateTime, +} + +#[derive(Clone, Debug, PartialEq, Eq)] +pub struct Booking { + pub from: DateTime, + pub to: DateTime, +} + +pub trait CalendarProvider { + type BookingError: Error; + fn get_availability(&self) -> impl Future; + fn book( + &self, + booking: BookingRequest, + ) -> impl Future>; +} + +pub fn has_conflict( + busy: &[(DateTime, DateTime)], + from: DateTime, + to: DateTime, +) -> bool { + busy.iter() + .any(|(busy_from, busy_to)| *busy_from < to && from < *busy_to) +} + +/// Convert a list of busy ranges into fixed-size free availability slots. +/// +/// Busy ranges are clamped to `[from, to]`, sorted, and merged. Only slots at +/// least `slot_minutes` long are returned. +pub fn availability_slots( + from: DateTime, + to: DateTime, + busy: &[(DateTime, DateTime)], + slot_minutes: i64, +) -> Availability { + if to <= from { + return Availability::default(); + } + + let mut busy: Vec<_> = busy + .iter() + .filter_map(|(start, end)| { + if end <= start || *end <= from || *start >= to { + None + } else { + Some(((*start).max(from), (*end).min(to))) + } + }) + .collect(); + busy.sort_by_key(|(start, _)| *start); + + let mut merged: Vec<(DateTime, DateTime)> = Vec::new(); + for (start, end) in busy { + if let Some((_, last_end)) = merged.last_mut() { + if start <= *last_end { + *last_end = (*last_end).max(end); + continue; + } + } + merged.push((start, end)); + } + + let slot_duration = Duration::minutes(slot_minutes.max(1)); + let mut slots = Vec::new(); + let mut cursor = from; + + for (busy_start, busy_end) in merged { + push_slots(&mut slots, cursor, busy_start, slot_duration); + cursor = busy_end.max(cursor); + } + push_slots(&mut slots, cursor, to, slot_duration); + + Availability { slots } +} + +fn push_slots( + slots: &mut Vec, + from: DateTime, + to: DateTime, + slot_duration: Duration, +) { + let mut cursor = from; + while cursor + slot_duration <= to { + let end = cursor + slot_duration; + slots.push(AvailabilitySlot { start: cursor, end }); + cursor = end; + } +} + +#[cfg(test)] +mod tests { + use super::*; + use chrono::TimeZone; + + #[test] + fn slots_exclude_busy_ranges() { + let from = Utc.with_ymd_and_hms(2026, 1, 1, 9, 0, 0).unwrap(); + let to = Utc.with_ymd_and_hms(2026, 1, 1, 12, 0, 0).unwrap(); + let busy = [( + Utc.with_ymd_and_hms(2026, 1, 1, 10, 0, 0).unwrap(), + Utc.with_ymd_and_hms(2026, 1, 1, 11, 0, 0).unwrap(), + )]; + + let availability = availability_slots(from, to, &busy, 30); + + assert_eq!(availability.slots.len(), 4); + assert_eq!(availability.slots[0].start, from); + assert_eq!(availability.slots[3].end, to); + } +} diff --git a/crates/provider-caldav/Cargo.toml b/crates/provider-caldav/Cargo.toml new file mode 100644 index 0000000..47dc1ff --- /dev/null +++ b/crates/provider-caldav/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "provider-caldav" +version = "0.1.0" +edition = "2024" + +[dependencies] +calendar-provider = { path = "../calendar-provider" } +chrono = "0.4.45" +reqwest = { version = "0.12.24", default-features = false, features = ["rustls-tls"] } +thiserror = "2.0.18" diff --git a/crates/provider-caldav/src/lib.rs b/crates/provider-caldav/src/lib.rs new file mode 100644 index 0000000..9520423 --- /dev/null +++ b/crates/provider-caldav/src/lib.rs @@ -0,0 +1,343 @@ +use calendar_provider::{ + Availability, Booking, BookingRequest, CalendarProvider, availability_slots, has_conflict, +}; +use chrono::{DateTime, Duration, NaiveDate, NaiveDateTime, Utc}; +use reqwest::{Method, StatusCode, header}; +use thiserror::Error; + +const DEFAULT_LOOKAHEAD_DAYS: i64 = 14; +const DEFAULT_SLOT_MINUTES: i64 = 30; + +#[derive(Clone, Debug)] +pub struct CalDavProvider { + client: reqwest::Client, + calendar_url: String, + username: String, + password: String, + lookahead_days: i64, + slot_minutes: i64, + booking_summary: String, +} + +#[derive(Debug, Error)] +pub enum ProviderError { + #[error("booking conflicts with an existing calendar event")] + Conflict, + #[error("calendar provider rejected the request as unauthorized")] + Unauthorized, + #[error("calendar provider HTTP request failed: {0}")] + Http(#[from] reqwest::Error), + #[error("calendar provider returned unexpected HTTP status {0}")] + HttpStatus(StatusCode), + #[error("invalid calendar provider request")] + InvalidRequest, +} + +impl CalDavProvider { + pub fn new( + client: reqwest::Client, + calendar_url: impl Into, + username: impl Into, + password: impl Into, + ) -> Self { + Self { + client, + calendar_url: calendar_url.into(), + username: username.into(), + password: password.into(), + lookahead_days: DEFAULT_LOOKAHEAD_DAYS, + slot_minutes: DEFAULT_SLOT_MINUTES, + booking_summary: "Schedj booking".to_string(), + } + } + + pub fn with_lookahead_days(mut self, days: i64) -> Self { + self.lookahead_days = days; + self + } + + pub fn with_slot_minutes(mut self, minutes: i64) -> Self { + self.slot_minutes = minutes; + self + } + + pub fn with_booking_summary(mut self, summary: impl Into) -> Self { + self.booking_summary = summary.into(); + self + } + + pub async fn availability_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result { + let busy = self.busy_between(from, to).await?; + Ok(availability_slots(from, to, &busy, self.slot_minutes)) + } + + pub async fn busy_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result, DateTime)>, ProviderError> { + if to <= from { + return Err(ProviderError::InvalidRequest); + } + + let report = calendar_query_report(from, to); + let response = self + .client + .request(report_method(), &self.calendar_url) + .basic_auth(&self.username, Some(&self.password)) + .header(header::CONTENT_TYPE, "application/xml; charset=utf-8") + .header("Depth", "1") + .body(report) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if !response.status().is_success() && response.status() != StatusCode::MULTI_STATUS { + return Err(ProviderError::HttpStatus(response.status())); + } + + let body = response.text().await?; + Ok(parse_ical_busy_ranges(&body)) + } + + pub async fn create_booking(&self, booking: BookingRequest) -> Result { + if booking.to <= booking.from { + return Err(ProviderError::InvalidRequest); + } + + let busy = self.busy_between(booking.from, booking.to).await?; + if has_conflict(&busy, booking.from, booking.to) { + return Err(ProviderError::Conflict); + } + + let uid = format!("schedj-{}@schedj", Utc::now().timestamp_micros()); + let ics = event_ics(&uid, booking.from, booking.to, &self.booking_summary); + let url = format!( + "{}{}.ics", + self.calendar_url.trim_end_matches('/'), + format!("/{}", percent_encode(&uid)) + ); + + let response = self + .client + .put(url) + .basic_auth(&self.username, Some(&self.password)) + .header(header::CONTENT_TYPE, "text/calendar; charset=utf-8") + .body(ics) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if !response.status().is_success() && response.status() != StatusCode::CREATED { + return Err(ProviderError::HttpStatus(response.status())); + } + + Ok(Booking { + from: booking.from, + to: booking.to, + }) + } +} + +impl CalendarProvider for CalDavProvider { + type BookingError = ProviderError; + + async fn get_availability(&self) -> Availability { + let from = Utc::now(); + let to = from + Duration::days(self.lookahead_days.max(1)); + self.availability_between(from, to) + .await + .unwrap_or_default() + } + + async fn book(&self, booking: BookingRequest) -> Result { + self.create_booking(booking).await + } +} + +fn report_method() -> Method { + Method::from_bytes(b"REPORT").expect("REPORT is a valid HTTP method") +} + +fn calendar_query_report(from: DateTime, to: DateTime) -> String { + format!( + r#" + + + + + + + + + + + + +"#, + ical_datetime(from), + ical_datetime(to) + ) +} + +fn event_ics(uid: &str, from: DateTime, to: DateTime, summary: &str) -> String { + format!( + "BEGIN:VCALENDAR\r\nVERSION:2.0\r\nPRODID:-//schedj//calendar//EN\r\nBEGIN:VEVENT\r\nUID:{}\r\nDTSTAMP:{}\r\nCREATED:{}\r\nDTSTART:{}\r\nDTEND:{}\r\nSUMMARY:{}\r\nEND:VEVENT\r\nEND:VCALENDAR\r\n", + escape_ical_text(uid), + ical_datetime(Utc::now()), + ical_datetime(Utc::now()), + ical_datetime(from), + ical_datetime(to), + escape_ical_text(summary) + ) +} + +fn ical_datetime(value: DateTime) -> String { + value.format("%Y%m%dT%H%M%SZ").to_string() +} + +fn parse_ical_busy_ranges(body: &str) -> Vec<(DateTime, DateTime)> { + let unescaped = unescape_xml(body); + let mut ranges = Vec::new(); + let mut remaining = unescaped.as_str(); + + while let Some(start_index) = remaining.find("BEGIN:VEVENT") { + remaining = &remaining[start_index + "BEGIN:VEVENT".len()..]; + let Some(end_index) = remaining.find("END:VEVENT") else { + break; + }; + let event = &remaining[..end_index]; + remaining = &remaining[end_index + "END:VEVENT".len()..]; + + let mut starts_at = None; + let mut ends_at = None; + for line in unfold_ical_lines(event) { + if line.starts_with("DTSTART") { + starts_at = line + .split_once(':') + .and_then(|(_, value)| parse_ical_datetime(value)); + } else if line.starts_with("DTEND") { + ends_at = line + .split_once(':') + .and_then(|(_, value)| parse_ical_datetime(value)); + } + } + + if let (Some(start), Some(end)) = (starts_at, ends_at) { + if end > start { + ranges.push((start, end)); + } + } + } + + ranges +} + +fn unfold_ical_lines(value: &str) -> Vec { + let mut lines = Vec::new(); + let mut current = String::new(); + + for raw_line in value.replace("\r\n", "\n").replace('\r', "\n").lines() { + if raw_line.starts_with(' ') || raw_line.starts_with('\t') { + current.push_str(raw_line.trim_start()); + } else { + if !current.is_empty() { + lines.push(current); + } + current = raw_line.to_string(); + } + } + + if !current.is_empty() { + lines.push(current); + } + + lines +} + +fn parse_ical_datetime(value: &str) -> Option> { + let value = value.trim(); + if value.len() == 8 { + let date = NaiveDate::parse_from_str(value, "%Y%m%d").ok()?; + return Some(DateTime::from_naive_utc_and_offset( + date.and_hms_opt(0, 0, 0)?, + Utc, + )); + } + + let trimmed = value.trim_end_matches('Z'); + for format in ["%Y%m%dT%H%M%S", "%Y%m%dT%H%M"] { + if let Ok(value) = NaiveDateTime::parse_from_str(trimmed, format) { + return Some(DateTime::from_naive_utc_and_offset(value, Utc)); + } + } + + DateTime::parse_from_rfc3339(value) + .map(|value| value.with_timezone(&Utc)) + .ok() +} + +fn unescape_xml(value: &str) -> String { + value + .replace("<", "<") + .replace(">", ">") + .replace(""", "\"") + .replace("'", "'") + .replace("&", "&") +} + +fn escape_ical_text(value: &str) -> String { + value + .replace('\\', "\\\\") + .replace(';', "\\;") + .replace(',', "\\,") + .replace('\n', "\\n") +} + +fn percent_encode(value: &str) -> String { + let mut encoded = String::new(); + for byte in value.bytes() { + if byte.is_ascii_alphanumeric() || matches!(byte, b'-' | b'_' | b'.' | b'~') { + encoded.push(byte as char); + } else { + encoded.push_str(&format!("%{byte:02X}")); + } + } + encoded +} + +#[cfg(test)] +mod tests { + use super::*; + use chrono::TimeZone; + + #[test] + fn parses_caldav_calendar_data() { + let xml = r#"BEGIN:VCALENDAR +BEGIN:VEVENT +DTSTART:20260101T100000Z +DTEND:20260101T103000Z +END:VEVENT +END:VCALENDAR"#; + + let busy = parse_ical_busy_ranges(xml); + + assert_eq!(busy.len(), 1); + assert_eq!( + busy[0].0, + Utc.with_ymd_and_hms(2026, 1, 1, 10, 0, 0).unwrap() + ); + } +} diff --git a/crates/provider-gcal/Cargo.toml b/crates/provider-gcal/Cargo.toml new file mode 100644 index 0000000..b6dcd7c --- /dev/null +++ b/crates/provider-gcal/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "provider-gcal" +version = "0.1.0" +edition = "2024" + +[dependencies] +calendar-provider = { path = "../calendar-provider" } +chrono = { version = "0.4.45", features = ["serde"] } +reqwest = { version = "0.12.24", default-features = false, features = ["json", "rustls-tls"] } +serde = { version = "1.0.228", features = ["derive"] } +serde_json = "1.0.150" +thiserror = "2.0.18" diff --git a/crates/provider-gcal/src/lib.rs b/crates/provider-gcal/src/lib.rs new file mode 100644 index 0000000..046d513 --- /dev/null +++ b/crates/provider-gcal/src/lib.rs @@ -0,0 +1,274 @@ +use calendar_provider::{ + Availability, Booking, BookingRequest, CalendarProvider, availability_slots, has_conflict, +}; +use chrono::{DateTime, Duration, Utc}; +use reqwest::{StatusCode, header}; +use serde::{Deserialize, Serialize}; +use std::collections::HashMap; +use thiserror::Error; + +const DEFAULT_API_BASE: &str = "https://www.googleapis.com/calendar/v3"; +const DEFAULT_LOOKAHEAD_DAYS: i64 = 14; +const DEFAULT_SLOT_MINUTES: i64 = 30; + +#[derive(Clone, Debug)] +pub struct GoogleCalendarProvider { + client: reqwest::Client, + access_token: String, + calendar_id: String, + api_base: String, + lookahead_days: i64, + slot_minutes: i64, + booking_summary: String, +} + +#[derive(Debug, Error)] +pub enum ProviderError { + #[error("booking conflicts with an existing calendar event")] + Conflict, + #[error("calendar provider rejected the request as unauthorized")] + Unauthorized, + #[error("calendar provider HTTP request failed: {0}")] + Http(#[from] reqwest::Error), + #[error("calendar provider JSON handling failed: {0}")] + Json(#[from] serde_json::Error), + #[error("calendar provider returned unexpected HTTP status {0}")] + HttpStatus(StatusCode), + #[error("invalid calendar provider request")] + InvalidRequest, +} + +#[derive(Serialize)] +#[serde(rename_all = "camelCase")] +struct FreeBusyRequest<'a> { + time_min: DateTime, + time_max: DateTime, + items: Vec>, +} + +#[derive(Serialize)] +struct CalendarItem<'a> { + id: &'a str, +} + +#[derive(Deserialize)] +struct FreeBusyResponse { + calendars: HashMap, +} + +#[derive(Deserialize)] +struct CalendarBusy { + busy: Vec, +} + +#[derive(Deserialize)] +struct BusyRange { + start: DateTime, + end: DateTime, +} + +#[derive(Serialize)] +struct EventRequest { + summary: String, + start: EventDateTime, + end: EventDateTime, +} + +#[derive(Serialize)] +#[serde(rename_all = "camelCase")] +struct EventDateTime { + date_time: DateTime, +} + +impl GoogleCalendarProvider { + pub fn new( + client: reqwest::Client, + access_token: impl Into, + calendar_id: impl Into, + ) -> Self { + Self { + client, + access_token: access_token.into(), + calendar_id: calendar_id.into(), + api_base: DEFAULT_API_BASE.to_string(), + lookahead_days: DEFAULT_LOOKAHEAD_DAYS, + slot_minutes: DEFAULT_SLOT_MINUTES, + booking_summary: "Schedj booking".to_string(), + } + } + + pub fn with_api_base(mut self, api_base: impl Into) -> Self { + self.api_base = api_base.into(); + self + } + + pub fn with_lookahead_days(mut self, days: i64) -> Self { + self.lookahead_days = days; + self + } + + pub fn with_slot_minutes(mut self, minutes: i64) -> Self { + self.slot_minutes = minutes; + self + } + + pub fn with_booking_summary(mut self, summary: impl Into) -> Self { + self.booking_summary = summary.into(); + self + } + + pub async fn availability_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result { + let busy = self.busy_between(from, to).await?; + Ok(availability_slots(from, to, &busy, self.slot_minutes)) + } + + pub async fn busy_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result, DateTime)>, ProviderError> { + if to <= from { + return Err(ProviderError::InvalidRequest); + } + + let response = self + .client + .post(format!("{}/freeBusy", self.api_base.trim_end_matches('/'))) + .bearer_auth(&self.access_token) + .header(header::CONTENT_TYPE, "application/json") + .json(&FreeBusyRequest { + time_min: from, + time_max: to, + items: vec![CalendarItem { + id: &self.calendar_id, + }], + }) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if !response.status().is_success() { + return Err(ProviderError::HttpStatus(response.status())); + } + + let response = response.json::().await?; + Ok(busy_ranges(response)) + } + + pub async fn create_booking(&self, booking: BookingRequest) -> Result { + if booking.to <= booking.from { + return Err(ProviderError::InvalidRequest); + } + + let busy = self.busy_between(booking.from, booking.to).await?; + if has_conflict(&busy, booking.from, booking.to) { + return Err(ProviderError::Conflict); + } + + let response = self + .client + .post(format!( + "{}/calendars/{}/events", + self.api_base.trim_end_matches('/'), + percent_encode(&self.calendar_id) + )) + .bearer_auth(&self.access_token) + .header(header::CONTENT_TYPE, "application/json") + .json(&EventRequest { + summary: self.booking_summary.clone(), + start: EventDateTime { + date_time: booking.from, + }, + end: EventDateTime { + date_time: booking.to, + }, + }) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if response.status() == StatusCode::CONFLICT { + return Err(ProviderError::Conflict); + } + if !response.status().is_success() { + return Err(ProviderError::HttpStatus(response.status())); + } + + Ok(Booking { + from: booking.from, + to: booking.to, + }) + } +} + +impl CalendarProvider for GoogleCalendarProvider { + type BookingError = ProviderError; + + async fn get_availability(&self) -> Availability { + let from = Utc::now(); + let to = from + Duration::days(self.lookahead_days.max(1)); + self.availability_between(from, to) + .await + .unwrap_or_default() + } + + async fn book(&self, booking: BookingRequest) -> Result { + self.create_booking(booking).await + } +} + +fn busy_ranges(response: FreeBusyResponse) -> Vec<(DateTime, DateTime)> { + response + .calendars + .into_values() + .flat_map(|calendar| calendar.busy) + .filter_map(|range| (range.end > range.start).then_some((range.start, range.end))) + .collect() +} + +fn percent_encode(value: &str) -> String { + let mut encoded = String::new(); + for byte in value.bytes() { + if byte.is_ascii_alphanumeric() || matches!(byte, b'-' | b'_' | b'.' | b'~') { + encoded.push(byte as char); + } else { + encoded.push_str(&format!("%{byte:02X}")); + } + } + encoded +} + +#[cfg(test)] +mod tests { + use super::*; + use chrono::TimeZone; + + fn parse_busy_ranges(body: &str) -> Result, DateTime)>, ProviderError> { + Ok(busy_ranges(serde_json::from_str(body)?)) + } + + #[test] + fn parses_freebusy_response() { + let body = r#"{"calendars":{"primary":{"busy":[{"start":"2026-01-01T10:00:00Z","end":"2026-01-01T10:30:00Z"}]}}}"#; + + let busy = parse_busy_ranges(body).unwrap(); + + assert_eq!(busy.len(), 1); + assert_eq!( + busy[0].0, + Utc.with_ymd_and_hms(2026, 1, 1, 10, 0, 0).unwrap() + ); + } +} diff --git a/crates/provider-msft/Cargo.toml b/crates/provider-msft/Cargo.toml new file mode 100644 index 0000000..6499310 --- /dev/null +++ b/crates/provider-msft/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "provider-msft" +version = "0.1.0" +edition = "2024" + +[dependencies] +calendar-provider = { path = "../calendar-provider" } +chrono = { version = "0.4.45", features = ["serde"] } +reqwest = { version = "0.12.24", default-features = false, features = ["json", "rustls-tls"] } +serde = { version = "1.0.228", features = ["derive"] } +serde_json = "1.0.150" +thiserror = "2.0.18" diff --git a/crates/provider-msft/src/lib.rs b/crates/provider-msft/src/lib.rs new file mode 100644 index 0000000..dc17dc9 --- /dev/null +++ b/crates/provider-msft/src/lib.rs @@ -0,0 +1,323 @@ +use calendar_provider::{ + Availability, Booking, BookingRequest, CalendarProvider, availability_slots, has_conflict, +}; +use chrono::{DateTime, Duration, NaiveDateTime, Utc}; +use reqwest::{StatusCode, header}; +use serde::{Deserialize, Serialize}; +use thiserror::Error; + +const DEFAULT_GRAPH_BASE: &str = "https://graph.microsoft.com/v1.0"; +const DEFAULT_LOOKAHEAD_DAYS: i64 = 14; +const DEFAULT_SLOT_MINUTES: i64 = 30; + +#[derive(Clone, Debug)] +pub struct MicrosoftCalendarProvider { + client: reqwest::Client, + access_token: String, + schedule_id: String, + user_id: Option, + calendar_id: Option, + graph_base: String, + lookahead_days: i64, + slot_minutes: i64, + booking_summary: String, +} + +#[derive(Debug, Error)] +pub enum ProviderError { + #[error("booking conflicts with an existing calendar event")] + Conflict, + #[error("calendar provider rejected the request as unauthorized")] + Unauthorized, + #[error("calendar provider HTTP request failed: {0}")] + Http(#[from] reqwest::Error), + #[error("calendar provider JSON handling failed: {0}")] + Json(#[from] serde_json::Error), + #[error("calendar provider returned unexpected HTTP status {0}")] + HttpStatus(StatusCode), + #[error("invalid calendar provider request")] + InvalidRequest, +} + +#[derive(Serialize)] +#[serde(rename_all = "camelCase")] +struct GetScheduleRequest<'a> { + schedules: Vec<&'a str>, + start_time: RequestDateTime, + end_time: RequestDateTime, + availability_view_interval: i64, +} + +#[derive(Serialize)] +struct EventRequest { + subject: String, + start: RequestDateTime, + end: RequestDateTime, +} + +#[derive(Serialize)] +#[serde(rename_all = "camelCase")] +struct RequestDateTime { + date_time: NaiveDateTime, + time_zone: &'static str, +} + +#[derive(Deserialize)] +struct GetScheduleResponse { + value: Vec, +} + +#[derive(Deserialize)] +#[serde(rename_all = "camelCase")] +struct Schedule { + schedule_items: Vec, +} + +#[derive(Deserialize)] +struct ScheduleItem { + start: ResponseDateTime, + end: ResponseDateTime, +} + +#[derive(Deserialize)] +#[serde(rename_all = "camelCase")] +struct ResponseDateTime { + date_time: NaiveDateTime, +} + +impl MicrosoftCalendarProvider { + pub fn new( + client: reqwest::Client, + access_token: impl Into, + schedule_id: impl Into, + ) -> Self { + Self { + client, + access_token: access_token.into(), + schedule_id: schedule_id.into(), + user_id: None, + calendar_id: None, + graph_base: DEFAULT_GRAPH_BASE.to_string(), + lookahead_days: DEFAULT_LOOKAHEAD_DAYS, + slot_minutes: DEFAULT_SLOT_MINUTES, + booking_summary: "Schedj booking".to_string(), + } + } + + pub fn with_user_id(mut self, user_id: impl Into) -> Self { + self.user_id = Some(user_id.into()); + self + } + + pub fn with_calendar_id(mut self, calendar_id: impl Into) -> Self { + self.calendar_id = Some(calendar_id.into()); + self + } + + pub fn with_graph_base(mut self, graph_base: impl Into) -> Self { + self.graph_base = graph_base.into(); + self + } + + pub fn with_lookahead_days(mut self, days: i64) -> Self { + self.lookahead_days = days; + self + } + + pub fn with_slot_minutes(mut self, minutes: i64) -> Self { + self.slot_minutes = minutes; + self + } + + pub fn with_booking_summary(mut self, summary: impl Into) -> Self { + self.booking_summary = summary.into(); + self + } + + pub async fn availability_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result { + let busy = self.busy_between(from, to).await?; + Ok(availability_slots(from, to, &busy, self.slot_minutes)) + } + + pub async fn busy_between( + &self, + from: DateTime, + to: DateTime, + ) -> Result, DateTime)>, ProviderError> { + if to <= from { + return Err(ProviderError::InvalidRequest); + } + + let response = self + .client + .post(format!( + "{}/{}/calendar/getSchedule", + self.graph_base.trim_end_matches('/'), + self.owner_path() + )) + .bearer_auth(&self.access_token) + .header(header::CONTENT_TYPE, "application/json") + .json(&GetScheduleRequest { + schedules: vec![&self.schedule_id], + start_time: graph_request_datetime(from), + end_time: graph_request_datetime(to), + availability_view_interval: self.slot_minutes.max(1), + }) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if !response.status().is_success() { + return Err(ProviderError::HttpStatus(response.status())); + } + + let response = response.json::().await?; + Ok(schedule_items(response)) + } + + pub async fn create_booking(&self, booking: BookingRequest) -> Result { + if booking.to <= booking.from { + return Err(ProviderError::InvalidRequest); + } + + let busy = self.busy_between(booking.from, booking.to).await?; + if has_conflict(&busy, booking.from, booking.to) { + return Err(ProviderError::Conflict); + } + + let response = self + .client + .post(self.create_event_url()) + .bearer_auth(&self.access_token) + .header(header::CONTENT_TYPE, "application/json") + .json(&EventRequest { + subject: self.booking_summary.clone(), + start: graph_request_datetime(booking.from), + end: graph_request_datetime(booking.to), + }) + .send() + .await?; + + if response.status() == StatusCode::UNAUTHORIZED + || response.status() == StatusCode::FORBIDDEN + { + return Err(ProviderError::Unauthorized); + } + if response.status() == StatusCode::CONFLICT { + return Err(ProviderError::Conflict); + } + if !response.status().is_success() { + return Err(ProviderError::HttpStatus(response.status())); + } + + Ok(Booking { + from: booking.from, + to: booking.to, + }) + } + + fn owner_path(&self) -> String { + match &self.user_id { + Some(user_id) => format!("users/{}", percent_encode(user_id)), + None => "me".to_string(), + } + } + + fn create_event_url(&self) -> String { + let owner_path = self.owner_path(); + match &self.calendar_id { + Some(calendar_id) => format!( + "{}/{}/calendars/{}/events", + self.graph_base.trim_end_matches('/'), + owner_path, + percent_encode(calendar_id) + ), + None => format!( + "{}/{}/events", + self.graph_base.trim_end_matches('/'), + owner_path + ), + } + } +} + +impl CalendarProvider for MicrosoftCalendarProvider { + type BookingError = ProviderError; + + async fn get_availability(&self) -> Availability { + let from = Utc::now(); + let to = from + Duration::days(self.lookahead_days.max(1)); + self.availability_between(from, to) + .await + .unwrap_or_default() + } + + async fn book(&self, booking: BookingRequest) -> Result { + self.create_booking(booking).await + } +} + +fn graph_request_datetime(value: DateTime) -> RequestDateTime { + RequestDateTime { + date_time: value.naive_utc(), + time_zone: "UTC", + } +} + +fn schedule_items(response: GetScheduleResponse) -> Vec<(DateTime, DateTime)> { + response + .value + .into_iter() + .flat_map(|schedule| schedule.schedule_items) + .filter_map(|item| { + let start = DateTime::from_naive_utc_and_offset(item.start.date_time, Utc); + let end = DateTime::from_naive_utc_and_offset(item.end.date_time, Utc); + (end > start).then_some((start, end)) + }) + .collect() +} + +fn percent_encode(value: &str) -> String { + let mut encoded = String::new(); + for byte in value.bytes() { + if byte.is_ascii_alphanumeric() || matches!(byte, b'-' | b'_' | b'.' | b'~') { + encoded.push(byte as char); + } else { + encoded.push_str(&format!("%{byte:02X}")); + } + } + encoded +} + +#[cfg(test)] +mod tests { + use super::*; + use chrono::TimeZone; + + fn parse_schedule_items( + body: &str, + ) -> Result, DateTime)>, ProviderError> { + Ok(schedule_items(serde_json::from_str(body)?)) + } + + #[test] + fn parses_get_schedule_response() { + let body = r#"{"value":[{"scheduleItems":[{"start":{"dateTime":"2026-01-01T10:00:00.0000000","timeZone":"UTC"},"end":{"dateTime":"2026-01-01T10:30:00.0000000","timeZone":"UTC"}}]}]}"#; + + let busy = parse_schedule_items(body).unwrap(); + + assert_eq!(busy.len(), 1); + assert_eq!( + busy[0].0, + Utc.with_ymd_and_hms(2026, 1, 1, 10, 0, 0).unwrap() + ); + } +} diff --git a/crates/server/Cargo.toml b/crates/server/Cargo.toml new file mode 100644 index 0000000..36bac8f --- /dev/null +++ b/crates/server/Cargo.toml @@ -0,0 +1,9 @@ +[package] +name = "schedj" +version = "0.1.0" +edition = "2024" + +[dependencies] +axum = "0.8.9" +chrono = "0.4.45" +tokio = { version = "1.52.3", features = ["macros", "rt-multi-thread"] } diff --git a/crates/server/src/main.rs b/crates/server/src/main.rs new file mode 100644 index 0000000..17fbc60 --- /dev/null +++ b/crates/server/src/main.rs @@ -0,0 +1,11 @@ +use axum::{Router, routing::get}; + +mod service; + +#[tokio::main] +async fn main() { + let app = Router::new().route("/", get(|| async { "Hello, World!" })); + + let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap(); + axum::serve(listener, app).await.unwrap(); +} diff --git a/crates/server/src/service.rs b/crates/server/src/service.rs new file mode 100644 index 0000000..66bcee4 --- /dev/null +++ b/crates/server/src/service.rs @@ -0,0 +1,23 @@ +use chrono::{DateTime, Utc}; + +struct Profile { + display_name: String, + created_at: DateTime, + description: String, +} + +struct Availability {} + +struct Booking {} + +struct BookingResult {} + +enum BookingError {} + +trait UserService { + async fn get_profile(&self) -> Profile; + async fn get_availability(&self) -> Availability; + async fn book(&self, booking: Booking) -> Result; +} + +struct User {} diff --git a/lexicons/com/schedj/actor/profile.json b/lexicons/com/schedj/actor/profile.json new file mode 100644 index 0000000..855da2e --- /dev/null +++ b/lexicons/com/schedj/actor/profile.json @@ -0,0 +1,38 @@ +{ + "defs": { + "main": { + "description": "TODO: describe purpose of this schema", + "key": "any", + "record": { + "properties": { + "avatar": { + "accept": ["image/png", "image/jpeg"], + "maxSize": 2000000, + "type": "blob" + }, + "createdAt": { + "format": "datetime", + "type": "string" + }, + "description": { + "maxGraphemes": 300, + "maxLength": 3000, + "type": "string" + }, + "name": { + "description": "TODO: title name of record; can not be empty", + "maxGraphemes": 64, + "maxLength": 640, + "minLength": 1, + "type": "string" + } + }, + "required": ["name", "createdAt"], + "type": "object" + }, + "type": "record" + } + }, + "id": "com.schedj.actor.profile", + "lexicon": 1 +} diff --git a/lexicons/com/schedj/book.json b/lexicons/com/schedj/book.json new file mode 100644 index 0000000..e397f16 --- /dev/null +++ b/lexicons/com/schedj/book.json @@ -0,0 +1,33 @@ +{ + "defs": { + "main": { + "description": "TODO: description of this API endpoint", + "input": { + "encoding": "application/json", + "schema": { + "properties": { + "subject": { + "format": "at-identifier", + "type": "string" + } + }, + "required": [ + "subject" + ], + "type": "object" + } + }, + "output": { + "encoding": "application/json", + "schema": { + "properties": {}, + "required": [], + "type": "object" + } + }, + "type": "procedure" + } + }, + "id": "com.schedj.book", + "lexicon": 1 +} diff --git a/lexicons/com/schedj/getAvailability.json b/lexicons/com/schedj/getAvailability.json new file mode 100644 index 0000000..5d214c4 --- /dev/null +++ b/lexicons/com/schedj/getAvailability.json @@ -0,0 +1,33 @@ +{ + "defs": { + "main": { + "description": "TODO: basic API endpoint", + "output": { + "encoding": "application/json", + "schema": { + "properties": { + "number": { + "type": "integer" + } + }, + "required": [ + "number" + ], + "type": "object" + } + }, + "parameters": { + "properties": { + "maximum": { + "description": "maximum size of response", + "type": "integer" + } + }, + "type": "params" + }, + "type": "query" + } + }, + "id": "com.schedj.getAvailability", + "lexicon": 1 +} diff --git a/lexicons/com/schedj/meetingType.json b/lexicons/com/schedj/meetingType.json new file mode 100644 index 0000000..a622f2f --- /dev/null +++ b/lexicons/com/schedj/meetingType.json @@ -0,0 +1,38 @@ +{ + "defs": { + "main": { + "description": "TODO: describe purpose of this schema", + "key": "any", + "record": { + "properties": { + "avatar": { + "accept": ["image/png", "image/jpeg"], + "maxSize": 2000000, + "type": "blob" + }, + "createdAt": { + "format": "datetime", + "type": "string" + }, + "description": { + "maxGraphemes": 300, + "maxLength": 3000, + "type": "string" + }, + "name": { + "description": "TODO: title name of record; can not be empty", + "maxGraphemes": 64, + "maxLength": 640, + "minLength": 1, + "type": "string" + } + }, + "required": ["name", "createdAt"], + "type": "object" + }, + "type": "record" + } + }, + "id": "com.schedj.meetingType", + "lexicon": 1 +}