/*
 * Minio Go Library for Amazon S3 Compatible Cloud Storage
 * Copyright 2015-2017 Minio, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package minio

import (
	"fmt"
	"net/http"
	"net/url"
	"testing"
	"time"

	"github.com/minio/minio-go/pkg/s3utils"
)

// Tests signature redacting function used
// in filtering on-wire Authorization header.
func TestRedactSignature(t *testing.T) {
	testCases := []struct {
		authValue                 string
		expectedRedactedAuthValue string
	}{
		{
			authValue:                 "AWS 1231313:888x000231==",
			expectedRedactedAuthValue: "AWS **REDACTED**:**REDACTED**",
		},
		{
			authValue:                 "AWS4-HMAC-SHA256 Credential=12312313/20170613/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=02131231312313213",
			expectedRedactedAuthValue: "AWS4-HMAC-SHA256 Credential=**REDACTED**/20170613/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=**REDACTED**",
		},
	}

	for i, testCase := range testCases {
		redactedAuthValue := redactSignature(testCase.authValue)
		if redactedAuthValue != testCase.expectedRedactedAuthValue {
			t.Errorf("Test %d: Expected %s, got %s", i+1, testCase.expectedRedactedAuthValue, redactedAuthValue)
		}
	}
}

// Tests filter header function by filtering out
// some custom header keys.
func TestFilterHeader(t *testing.T) {
	header := http.Header{}
	header.Set("Content-Type", "binary/octet-stream")
	header.Set("Content-Encoding", "gzip")
	newHeader := filterHeader(header, []string{"Content-Type"})
	if len(newHeader) > 1 {
		t.Fatalf("Unexpected size of the returned header, should be 1, got %d", len(newHeader))
	}
	if newHeader.Get("Content-Encoding") != "gzip" {
		t.Fatalf("Unexpected content-encoding value, expected 'gzip', got %s", newHeader.Get("Content-Encoding"))
	}
}

// Tests for 'getEndpointURL(endpoint string, inSecure bool)'.
func TestGetEndpointURL(t *testing.T) {
	testCases := []struct {
		// Inputs.
		endPoint string
		secure   bool

		// Expected result.
		result string
		err    error
		// Flag indicating whether the test is expected to pass or not.
		shouldPass bool
	}{
		{"s3.amazonaws.com", true, "https://s3.amazonaws.com", nil, true},
		{"s3.cn-north-1.amazonaws.com.cn", true, "https://s3.cn-north-1.amazonaws.com.cn", nil, true},
		{"s3.amazonaws.com", false, "http://s3.amazonaws.com", nil, true},
		{"s3.cn-north-1.amazonaws.com.cn", false, "http://s3.cn-north-1.amazonaws.com.cn", nil, true},
		{"192.168.1.1:9000", false, "http://192.168.1.1:9000", nil, true},
		{"192.168.1.1:9000", true, "https://192.168.1.1:9000", nil, true},
		{"s3.amazonaws.com:443", true, "https://s3.amazonaws.com:443", nil, true},
		{"13333.123123.-", true, "", ErrInvalidArgument(fmt.Sprintf("Endpoint: %s does not follow ip address or domain name standards.", "13333.123123.-")), false},
		{"13333.123123.-", true, "", ErrInvalidArgument(fmt.Sprintf("Endpoint: %s does not follow ip address or domain name standards.", "13333.123123.-")), false},
		{"storage.googleapis.com:4000", true, "", ErrInvalidArgument("Google Cloud Storage endpoint should be 'storage.googleapis.com'."), false},
		{"s3.aamzza.-", true, "", ErrInvalidArgument(fmt.Sprintf("Endpoint: %s does not follow ip address or domain name standards.", "s3.aamzza.-")), false},
		{"", true, "", ErrInvalidArgument("Endpoint:  does not follow ip address or domain name standards."), false},
	}

	for i, testCase := range testCases {
		result, err := getEndpointURL(testCase.endPoint, testCase.secure)
		if err != nil && testCase.shouldPass {
			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
		}
		if err == nil && !testCase.shouldPass {
			t.Errorf("Test %d: Expected to fail with <ERROR> \"%s\", but passed instead", i+1, testCase.err.Error())
		}
		// Failed as expected, but does it fail for the expected reason.
		if err != nil && !testCase.shouldPass {
			if err.Error() != testCase.err.Error() {
				t.Errorf("Test %d: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead", i+1, testCase.err.Error(), err.Error())
			}
		}

		// Test passes as expected, but the output values are verified for correctness here.
		if err == nil && testCase.shouldPass {
			if testCase.result != result.String() {
				t.Errorf("Test %d: Expected the result Url to be \"%s\", but found \"%s\" instead", i+1, testCase.result, result.String())
			}
		}
	}
}

// Tests validate end point validator.
func TestIsValidEndpointURL(t *testing.T) {
	testCases := []struct {
		url string
		err error
		// Flag indicating whether the test is expected to pass or not.
		shouldPass bool
	}{
		{"", ErrInvalidArgument("Endpoint url cannot be empty."), false},
		{"/", nil, true},
		{"https://s3.amazonaws.com", nil, true},
		{"https://s3.cn-north-1.amazonaws.com.cn", nil, true},
		{"https://s3-us-gov-west-1.amazonaws.com", nil, true},
		{"https://s3-fips-us-gov-west-1.amazonaws.com", nil, true},
		{"https://s3.amazonaws.com/", nil, true},
		{"https://storage.googleapis.com/", nil, true},
		{"https://z3.amazonaws.com", nil, true},
		{"https://mybalancer.us-east-1.elb.amazonaws.com", nil, true},
		{"192.168.1.1", ErrInvalidArgument("Endpoint url cannot have fully qualified paths."), false},
		{"https://amazon.googleapis.com/", ErrInvalidArgument("Google Cloud Storage endpoint should be 'storage.googleapis.com'."), false},
		{"https://storage.googleapis.com/bucket/", ErrInvalidArgument("Endpoint url cannot have fully qualified paths."), false},
		{"https://s3.amazonaws.com/bucket/object", ErrInvalidArgument("Endpoint url cannot have fully qualified paths."), false},
	}

	for i, testCase := range testCases {
		var u url.URL
		if testCase.url == "" {
			u = sentinelURL
		} else {
			u1, err := url.Parse(testCase.url)
			if err != nil {
				t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err)
			}
			u = *u1
		}
		err := isValidEndpointURL(u)
		if err != nil && testCase.shouldPass {
			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err)
		}
		if err == nil && !testCase.shouldPass {
			t.Errorf("Test %d: Expected to fail with <ERROR> \"%s\", but passed instead", i+1, testCase.err)
		}
		// Failed as expected, but does it fail for the expected reason.
		if err != nil && !testCase.shouldPass {
			if err.Error() != testCase.err.Error() {
				t.Errorf("Test %d: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead", i+1, testCase.err, err)
			}
		}

	}
}

func TestDefaultBucketLocation(t *testing.T) {
	testCases := []struct {
		endpointURL      url.URL
		regionOverride   string
		expectedLocation string
	}{
		// Region override is set URL is ignored. - Test 1.
		{
			endpointURL:      url.URL{Host: "s3-fips-us-gov-west-1.amazonaws.com"},
			regionOverride:   "us-west-1",
			expectedLocation: "us-west-1",
		},
		// No region override, url based preferenced is honored - Test 2.
		{
			endpointURL:      url.URL{Host: "s3-fips-us-gov-west-1.amazonaws.com"},
			regionOverride:   "",
			expectedLocation: "us-gov-west-1",
		},
		// Region override is honored - Test 3.
		{
			endpointURL:      url.URL{Host: "s3.amazonaws.com"},
			regionOverride:   "us-west-1",
			expectedLocation: "us-west-1",
		},
		// China region should be honored, region override not provided. - Test 4.
		{
			endpointURL:      url.URL{Host: "s3.cn-north-1.amazonaws.com.cn"},
			regionOverride:   "",
			expectedLocation: "cn-north-1",
		},
		// No region provided, no standard region strings provided as well. - Test 5.
		{
			endpointURL:      url.URL{Host: "s3.amazonaws.com"},
			regionOverride:   "",
			expectedLocation: "us-east-1",
		},
	}

	for i, testCase := range testCases {
		retLocation := getDefaultLocation(testCase.endpointURL, testCase.regionOverride)
		if testCase.expectedLocation != retLocation {
			t.Errorf("Test %d: Expected location %s, got %s", i+1, testCase.expectedLocation, retLocation)
		}
	}
}

// Tests validate the expiry time validator.
func TestIsValidExpiry(t *testing.T) {
	testCases := []struct {
		// Input.
		duration time.Duration
		// Expected result.
		err error
		// Flag to indicate whether the test should pass.
		shouldPass bool
	}{
		{100 * time.Millisecond, ErrInvalidArgument("Expires cannot be lesser than 1 second."), false},
		{604801 * time.Second, ErrInvalidArgument("Expires cannot be greater than 7 days."), false},
		{0 * time.Second, ErrInvalidArgument("Expires cannot be lesser than 1 second."), false},
		{1 * time.Second, nil, true},
		{10000 * time.Second, nil, true},
		{999 * time.Second, nil, true},
	}

	for i, testCase := range testCases {
		err := isValidExpiry(testCase.duration)
		if err != nil && testCase.shouldPass {
			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
		}
		if err == nil && !testCase.shouldPass {
			t.Errorf("Test %d: Expected to fail with <ERROR> \"%s\", but passed instead", i+1, testCase.err.Error())
		}
		// Failed as expected, but does it fail for the expected reason.
		if err != nil && !testCase.shouldPass {
			if err.Error() != testCase.err.Error() {
				t.Errorf("Test %d: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead", i+1, testCase.err.Error(), err.Error())
			}
		}

	}
}

// Tests validate the bucket name validator.
func TestIsValidBucketName(t *testing.T) {
	testCases := []struct {
		// Input.
		bucketName string
		// Expected result.
		err error
		// Flag to indicate whether test should Pass.
		shouldPass bool
	}{
		{".mybucket", ErrInvalidBucketName("Bucket name contains invalid characters"), false},
		{"mybucket.", ErrInvalidBucketName("Bucket name contains invalid characters"), false},
		{"mybucket-", ErrInvalidBucketName("Bucket name contains invalid characters"), false},
		{"my", ErrInvalidBucketName("Bucket name cannot be smaller than 3 characters"), false},
		{"", ErrInvalidBucketName("Bucket name cannot be empty"), false},
		{"my..bucket", ErrInvalidBucketName("Bucket name contains invalid characters"), false},
		{"my.bucket.com", nil, true},
		{"my-bucket", nil, true},
		{"123my-bucket", nil, true},
	}

	for i, testCase := range testCases {
		err := s3utils.CheckValidBucketName(testCase.bucketName)
		if err != nil && testCase.shouldPass {
			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
		}
		if err == nil && !testCase.shouldPass {
			t.Errorf("Test %d: Expected to fail with <ERROR> \"%s\", but passed instead", i+1, testCase.err.Error())
		}
		// Failed as expected, but does it fail for the expected reason.
		if err != nil && !testCase.shouldPass {
			if err.Error() != testCase.err.Error() {
				t.Errorf("Test %d: Expected to fail with error \"%s\", but instead failed with error \"%s\" instead", i+1, testCase.err.Error(), err.Error())
			}
		}

	}

}

// Tests if header is standard supported header
func TestIsStandardHeader(t *testing.T) {
	testCases := []struct {
		// Input.
		header string
		// Expected result.
		expectedValue bool
	}{
		{"content-encoding", true},
		{"content-type", true},
		{"cache-control", true},
		{"content-disposition", true},
		{"random-header", false},
	}

	for i, testCase := range testCases {
		actual := isStandardHeader(testCase.header)
		if actual != testCase.expectedValue {
			t.Errorf("Test %d: Expected to pass, but failed", i+1)
		}
	}

}

// Tests if header is server encryption header
func TestIsSSEHeader(t *testing.T) {
	testCases := []struct {
		// Input.
		header string
		// Expected result.
		expectedValue bool
	}{
		{"x-amz-server-side-encryption", true},
		{"x-amz-server-side-encryption-aws-kms-key-id", true},
		{"x-amz-server-side-encryption-context", true},
		{"x-amz-server-side-encryption-customer-algorithm", true},
		{"x-amz-server-side-encryption-customer-key", true},
		{"x-amz-server-side-encryption-customer-key-MD5", true},
		{"random-header", false},
	}

	for i, testCase := range testCases {
		actual := isSSEHeader(testCase.header)
		if actual != testCase.expectedValue {
			t.Errorf("Test %d: Expected to pass, but failed", i+1)
		}
	}
}

// Tests if header is client encryption header
func TestIsCSEHeader(t *testing.T) {
	testCases := []struct {
		// Input.
		header string
		// Expected result.
		expectedValue bool
	}{
		{"x-amz-iv", true},
		{"x-amz-key", true},
		{"x-amz-matdesc", true},
		{"x-amz-meta-x-amz-iv", true},
		{"x-amz-meta-x-amz-key", true},
		{"x-amz-meta-x-amz-matdesc", true},
		{"random-header", false},
	}

	for i, testCase := range testCases {
		actual := isCSEHeader(testCase.header)
		if actual != testCase.expectedValue {
			t.Errorf("Test %d: Expected to pass, but failed", i+1)
		}
	}

}

// Tests if header is x-amz-meta or x-amz-acl
func TestIsAmzHeader(t *testing.T) {
	testCases := []struct {
		// Input.
		header string
		// Expected result.
		expectedValue bool
	}{
		{"x-amz-iv", false},
		{"x-amz-key", false},
		{"x-amz-matdesc", false},
		{"x-amz-meta-x-amz-iv", true},
		{"x-amz-meta-x-amz-key", true},
		{"x-amz-meta-x-amz-matdesc", true},
		{"x-amz-acl", true},
		{"random-header", false},
	}

	for i, testCase := range testCases {
		actual := isAmzHeader(testCase.header)
		if actual != testCase.expectedValue {
			t.Errorf("Test %d: Expected to pass, but failed", i+1)
		}
	}

}