feat: implement file list retrieval for file drop components

src/components/file_drop.rs

@@ -8,7 +8,11 @@ use leptos_oidc::AuthSignal;
 use leptos_use::{UseDropZoneOptions, UseDropZoneReturn, use_drop_zone_with_options};
 
 #[component]
-pub fn FileDrop(#[prop(into)] name: String, #[prop(into)] form_id: String) -> impl IntoView {
+pub fn FileDrop(
+    #[prop(into)] name: String,
+    #[prop(into)] form_id: String,
+    #[prop()] existing_files: Resource<Result<Vec<String>, ServerFnError>>,
+) -> impl IntoView {
     let zone_ref = NodeRef::<Label>::new();
     let input_ref = NodeRef::<Input>::new();
 
@@ -121,6 +125,16 @@ pub fn FileDrop(#[prop(into)] name: String, #[prop(into)] form_id: String) -> im
     });
 
     view! {
+        {move || {
+            existing_files
+                .get()
+                .map(|result| {
+                    if let Ok(files) = result {
+                        file_name_list.set(files);
+                    }
+                })
+        }}
+
         <label
             node_ref=zone_ref
             class="m-1.5 p-2.5 flex flex-col transition-color duration-200 rounded-lg border-2 items-center cursor-pointer"

src/pages/api/files.rs

@@ -2,12 +2,17 @@
 use leptos::prelude::*;
 use server_fn::codec::{MultipartData, MultipartFormData};
 
+#[cfg(feature = "ssr")]
+mod imports {
+    pub use super::super::{MAIN_TABLE_NAME, S3_BUCKET_NAME};
+    pub use crate::pages::api::tokens::validate_and_get_token_info;
+    pub use crate::utils::server::create_aws_config;
+    pub use aws_sdk_dynamodb::types::{AttributeValue, ReturnValue, Select};
+}
+
 #[server(input = MultipartFormData)]
 pub async fn upload_file(data: MultipartData) -> Result<String, ServerFnError> {
-    use super::{MAIN_TABLE_NAME, S3_BUCKET_NAME};
-    use crate::pages::api::tokens::validate_and_get_token_info;
-    use crate::utils::server::create_aws_config;
-    use aws_sdk_dynamodb::types::AttributeValue;
+    use imports::*;
 
     let mut multipart = data.into_inner().unwrap();
 
@@ -131,10 +136,7 @@ pub async fn delete_file(
     input_name: String,
     file_name: String,
 ) -> Result<String, ServerFnError> {
-    use super::{MAIN_TABLE_NAME, S3_BUCKET_NAME};
-    use crate::pages::api::tokens::validate_and_get_token_info;
-    use crate::utils::server::create_aws_config;
-    use aws_sdk_dynamodb::types::{AttributeValue, ReturnValue};
+    use imports::*;
 
     let user_claims = validate_and_get_token_info(access_token).await?;
     let subject = user_claims.subject;
@@ -187,3 +189,46 @@ pub async fn delete_file(
 
     Ok(file_name)
 }
+
+#[server]
+pub async fn list_files(
+    access_token: String,
+    form_id: String,
+    input_name: String,
+) -> Result<Vec<String>, ServerFnError> {
+    use imports::*;
+
+    let user_claims = validate_and_get_token_info(access_token).await?;
+    let subject = user_claims.subject;
+
+    let entry_hk = format!("STUDENT#{subject}");
+    let entry_sk = format!("FILE#{form_id}#{input_name}");
+
+    debug_log!("Getting file list: HK = {}, SK = {}", entry_hk, entry_sk);
+
+    let dynamo_client = aws_sdk_dynamodb::Client::new(&create_aws_config().await);
+
+    dynamo_client
+        .query()
+        .table_name(MAIN_TABLE_NAME)
+        .key_condition_expression("HK = :hk AND begins_with(SK, :sk)")
+        .expression_attribute_values(":hk".to_string(), AttributeValue::S(entry_hk))
+        .expression_attribute_values(":sk".to_string(), AttributeValue::S(entry_sk))
+        .send()
+        .await
+        .map(|output| {
+            let Some(items) = output.items else {
+                return vec![];
+            };
+
+            items
+                .into_iter()
+                .filter_map(|item| {
+                    item.get("file_name")
+                        .map(|v| v.as_s().ok().cloned())
+                        .flatten()
+                })
+                .collect::<Vec<String>>()
+        })
+        .map_err(|e| ServerFnError::new(format!("Couldn't list files: {}", e.to_string())))
+}

src/pages/student/financial_page.rs

@@ -1,11 +1,30 @@
-use crate::components::{FileDrop, Header};
+use crate::components::{FileDrop, Header, Loading};
+use crate::pages::api::files::list_files;
 use leptos::prelude::*;
+use leptos_oidc::AuthSignal;
 
 #[component]
 pub fn StudentFinancialPage() -> impl IntoView {
     // This is where we'll get information about the files that have been uploaded.
     // For now, we'll leave it blank.
 
+    let auth = expect_context::<AuthSignal>();
+
+    let files_resource = Resource::new(
+        move || {
+            auth.try_with(|a| a.authenticated().map(|a| a.access_token()))
+                .flatten()
+        },
+        async move |access_token| {
+            list_files(
+                access_token.unwrap_or_default(),
+                "financial_info".to_string(),
+                "fafsa".to_string(),
+            )
+            .await
+        },
+    );
+
     view! {
         <div class="flex flex-1" />
         <div class="flex flex-col flex-2 mt-6">
@@ -14,7 +33,9 @@ pub fn StudentFinancialPage() -> impl IntoView {
                 title="Financial Information"
                 description="Please upload your FAFSA SAR (Student Aid Report) here."
             />
-            <FileDrop name="fafsa" form_id="financial_info" />
+            <Suspense fallback=Loading>
+                <FileDrop name="fafsa" form_id="financial_info" existing_files=files_resource />
+            </Suspense>
         // </ValidatedForm>
         </div>
         <div class="flex flex-1" />