Support base64-encoded event `eid`s

Event invitation emails include event ids encoded as "eid"s. These are
base64-encoded strings of:

    {event_id} {user_email}

Add a new function that decodes the ID from the base64 string if the
input ID is base64-encoded. Otherwise, return the input event ID.

1 files changed, 28 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 0bc6063..978714c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,15 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
 name = "autocfg"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -207,11 +216,13 @@ dependencies = [
 name = "google-calendar-rsvp"
 version = "0.0.1"
 dependencies = [
+ "base64",
  "exitcode",
  "google-calendar3",
  "home",
  "hyper",
  "hyper-rustls",
+ "regex",
  "serde_json",
  "tokio",
  "yup-oauth2",
@@ -606,6 +617,23 @@ dependencies = [
 ]
 
 [[package]]
+name = "regex"
+version = "1.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+
+[[package]]
 name = "ring"
 version = "0.16.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"