refactor: add prefix support for storage column configuration and update blob path generation

internal/app/azure/main.go

@@ -4,10 +4,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"net/http"
 	"net/url"
+	"path"
 
 	"git.ksdemosapps.com/kylesoda/go-migrate/internal/app/config"
 	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob"
+	"github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blob"
 )
 
 var (
@@ -72,16 +75,15 @@ func (c *Client) UploadAndGetURL(ctx context.Context, blobPath string, buffer []
 		return "", ErrInvalidInput
 	}
 
-	fullPath := blobPath
-	if c.azureStorageConfig.Prefix != "" {
-		fullPath, _ = url.JoinPath(c.azureStorageConfig.Prefix, blobPath)
+	fullPath := path.Join(c.azureStorageConfig.Prefix, blobPath)
+
+	contentType := http.DetectContentType(buffer)
+	opts := &azblob.UploadBufferOptions{
+		HTTPHeaders: &blob.HTTPHeaders{BlobContentType: &contentType},
+	}
+	if _, err := c.client.UploadBuffer(ctx, c.azureStorageConfig.Container, fullPath, buffer, opts); err != nil {
+		return "", fmt.Errorf("uploading blob %s: %w", fullPath, err)
 	}
 
-	if err := c.UploadBuffer(ctx, c.azureStorageConfig.Container, fullPath, buffer); err != nil {
-		return "", err
-	}
-
-	blobEndpoint, _ := url.JoinPath(c.azureStorageConfig.ServiceURL, c.azureStorageConfig.AccountName)
-	blobURL, _ := url.JoinPath(blobEndpoint, c.azureStorageConfig.Container, fullPath)
-	return blobURL, nil
+	return fullPath, nil
 }