add script for generating Azure SAS file

scripts/generateAzureSasUrls.sh

@@ -0,0 +1,179 @@
+#!/bin/bash
+# Script to generate Azure Blob Storage SAS URLs for image files in JSONL format
+# requires az cli installed and logged in https://learn.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest
+# Usage: ./generateAzureSasUrls.sh <container-url> [output-file] [expiration-hours] [parallel-jobs]
+# Example: ./generateAzureSasUrls.sh https://myaccount.blob.core.windows.net/mycontainer output.jsonl 6 8
+# Or with curl:
+# curl -fsSL https://raw.githubusercontent.com/roboflow/roboflow-python/main/scripts/generateAzureSasUrls.sh | bash -s -- https://myaccount.blob.core.windows.net/mycontainer output.jsonl
+
+set -e
+
+# Check if container URL is provided
+if [ -z "$1" ]; then
+    echo "Error: Azure container URL is required"
+    echo "Usage: $0 <container-url> [output-file] [expiration-hours] [parallel-jobs]"
+    echo "Example: $0 https://myaccount.blob.core.windows.net/mycontainer output.jsonl 6 8"
+    exit 1
+fi
+
+CONTAINER_URL="$1"
+OUTPUT_FILE="${2:-signed_urls.jsonl}"
+EXPIRATION_HOURS="${3:-6}"  # Default: 6 hours
+PARALLEL_JOBS="${4:-20}"  # Default: 20 parallel jobs
+
+# Remove trailing slash from container URL if present
+CONTAINER_URL="${CONTAINER_URL%/}"
+
+# Extract storage account and container from URL
+STORAGE_ACCOUNT=$(echo "$CONTAINER_URL" | sed -E 's|https://([^.]+)\.blob\.core\.windows\.net/.*|\1|')
+CONTAINER=$(echo "$CONTAINER_URL" | sed -E 's|https://[^/]+/([^/]+).*|\1|')
+
+# Optional: Extract path prefix if provided in URL
+PATH_PREFIX=$(echo "$CONTAINER_URL" | sed -E 's|https://[^/]+/[^/]+/?(.*)|/\1|' | sed 's|^//$||')
+if [ "$PATH_PREFIX" = "/" ]; then
+    PATH_PREFIX=""
+fi
+
+# Image file extensions to include (regex pattern for grep)
+IMAGE_PATTERN='\.(jpg|jpeg|png|gif|bmp|webp|tiff|tif|svg)$'
+
+# Calculate expiry time in UTC (cross-platform compatible)
+if date --version >/dev/null 2>&1; then
+    # GNU date (Linux)
+    EXPIRY=$(date -u -d "+${EXPIRATION_HOURS} hours" '+%Y-%m-%dT%H:%MZ')
+else
+    # BSD date (macOS)
+    EXPIRY=$(date -u -v+${EXPIRATION_HOURS}H '+%Y-%m-%dT%H:%MZ')
+fi
+
+# Function to process a single blob
+process_blob() {
+    local blob_name="$1"
+    local storage_account="$2"
+    local container="$3"
+    local expiry="$4"
+
+    # Generate SAS token for the specific blob (redirect stderr to suppress warnings)
+    local sas_token=$(az storage blob generate-sas \
+        --account-name "$storage_account" \
+        --container-name "$container" \
+        --name "$blob_name" \
+        --permissions r \
+        --expiry "$expiry" \
+        --https-only \
+        --auth-mode key \
+        --output tsv 2>/dev/null)
+
+    if [ $? -eq 0 ]; then
+        # Construct the full URL with SAS token
+        local signed_url="https://${storage_account}.blob.core.windows.net/${container}/${blob_name}?${sas_token}"
+
+        # Create name with full path using double underscores instead of slashes
+        local name_with_path=$(echo "$blob_name" | sed 's|/|__|g')
+
+        # Output JSONL
+        echo "{\"name\": \"$name_with_path\", \"url\": \"$signed_url\"}"
+    fi
+}
+
+# Alternative function using connection string or SAS token at account level
+process_blob_with_connection() {
+    local blob_name="$1"
+    local storage_account="$2"
+    local container="$3"
+    local expiry="$4"
+
+    # Generate SAS token using connection string if AZURE_STORAGE_CONNECTION_STRING is set
+    if [ -n "$AZURE_STORAGE_CONNECTION_STRING" ]; then
+        local sas_token=$(az storage blob generate-sas \
+            --connection-string "$AZURE_STORAGE_CONNECTION_STRING" \
+            --container-name "$container" \
+            --name "$blob_name" \
+            --permissions r \
+            --expiry "$expiry" \
+            --https-only \
+            --output tsv 2>/dev/null)
+    else
+        # Use account key if available
+        local sas_token=$(az storage blob generate-sas \
+            --account-name "$storage_account" \
+            --container-name "$container" \
+            --name "$blob_name" \
+            --permissions r \
+            --expiry "$expiry" \
+            --https-only \
+            --output tsv 2>/dev/null)
+    fi
+
+    if [ $? -eq 0 ]; then
+        local signed_url="https://${storage_account}.blob.core.windows.net/${container}/${blob_name}?${sas_token}"
+        local name_with_path=$(echo "$blob_name" | sed 's|/|__|g')
+        echo "{\"name\": \"$name_with_path\", \"url\": \"$signed_url\"}"
+    fi
+}
+
+# Check if user is logged in to Azure CLI
+if ! az account show &>/dev/null; then
+    echo "Error: Not logged in to Azure CLI. Please run 'az login' first."
+    exit 1
+fi
+
+# Export function and variables for xargs
+export -f process_blob process_blob_with_connection
+export STORAGE_ACCOUNT CONTAINER EXPIRY
+export AZURE_STORAGE_CONNECTION_STRING
+
+echo "Listing blobs from container: $CONTAINER in account: $STORAGE_ACCOUNT..."
+if [ -n "$PATH_PREFIX" ]; then
+    echo "Using path prefix: $PATH_PREFIX"
+fi
+
+# Get list of all blobs, filter for images, and process in parallel
+# Create a temporary file for the blob list to avoid stdin issues
+BLOB_LIST=$(mktemp)
+trap "rm -f $BLOB_LIST" EXIT
+
+if [ -n "$PATH_PREFIX" ]; then
+    # List blobs with prefix
+    az storage blob list \
+        --account-name "$STORAGE_ACCOUNT" \
+        --container-name "$CONTAINER" \
+        --prefix "$PATH_PREFIX" \
+        --auth-mode key \
+        --query "[].name" \
+        --output tsv 2>/dev/null | grep -iE "$IMAGE_PATTERN" > "$BLOB_LIST"
+else
+    # List all blobs in container
+    az storage blob list \
+        --account-name "$STORAGE_ACCOUNT" \
+        --container-name "$CONTAINER" \
+        --auth-mode key \
+        --query "[].name" \
+        --output tsv 2>/dev/null | grep -iE "$IMAGE_PATTERN" > "$BLOB_LIST"
+fi
+
+# Process blobs in parallel using background jobs
+: > "$OUTPUT_FILE"  # Clear output file
+COUNT=0
+
+while IFS= read -r blob_name; do
+    # Process blob in background
+    process_blob "$blob_name" "$STORAGE_ACCOUNT" "$CONTAINER" "$EXPIRY" >> "$OUTPUT_FILE" &
+
+    # Limit concurrent jobs
+    ((COUNT++))
+    if [ $((COUNT % PARALLEL_JOBS)) -eq 0 ]; then
+        wait  # Wait for current batch to complete
+    fi
+done < "$BLOB_LIST"
+
+# Wait for any remaining jobs
+wait
+
+# Display the results
+cat "$OUTPUT_FILE"
+
+echo ""
+echo "Done! SAS URLs written to $OUTPUT_FILE"
+echo "Total images processed: $(wc -l < "$OUTPUT_FILE" 2>/dev/null || echo 0)"
+echo "SAS tokens valid until: $EXPIRY"