1 files changed, 46 insertions, 0 deletions
diff --git a/src/group.rs b/src/group.rs
index 64a6847..c01d5ae 100644
--- a/src/group.rs
+++ b/src/group.rs
@@ -18,6 +18,7 @@ use crate::{
     client::{self, Client},
     error::Error,
 };
+use serde::{Serialize, Serializer};
 
 pub struct GroupFetcher<'a> {
     client: &'a Client,
@@ -32,3 +33,48 @@ impl<'a> GroupFetcher<'a> {
         self.client.fetch_stream(client::ZOTAPI_GROUP_PATH, &())
     }
 }
+
+
+enum GroupSelector<'a> {
+    Id(u64),
+    Name(&'a str),
+}
+
+impl<'a> Serialize for GroupSelector<'a> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match *self {
+            GroupSelector::Id(id) => [("group_id", id)].serialize(serializer),
+            GroupSelector::Name(n) => [("group_name", n)].serialize(serializer),
+        }
+    }
+}
+
+pub struct GroupMembersFetcher<'a> {
+    client: &'a Client,
+    id: Option<GroupSelector<'a>>,
+}
+
+impl<'a> GroupMembersFetcher<'a> {
+    pub fn new(client: &'a Client) -> GroupMembersFetcher<'a> {
+        GroupMembersFetcher { client, id: None }
+    }
+
+    pub fn by_group_id(&mut self, id: u64) -> &GroupMembersFetcher<'a> {
+        self.id = Some(GroupSelector::Id(id));
+        self
+    }
+
+    pub fn by_group_name(&mut self, name: &'a str) -> &GroupMembersFetcher<'a> {
+        self.id = Some(GroupSelector::Name(name));
+        self
+    }
+
+    pub fn fetch(&self) -> Result<String, Error> {
+        self.client.fetch_stream(
+            client::ZOTAPI_GROUP_MEMBERS_PATH,
+            &self.id.as_ref().unwrap())
+    }
+}