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91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
package datasource
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import (
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"errors"
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"fmt"
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"net/url"
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"regexp"
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"strings"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/services/datasources"
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"github.com/grafana/grafana/pkg/tsdb/mssql"
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)
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var logger = log.New("datasource")
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// requiredURL contains the set of data sources that require a URL.
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var requiredURL = map[string]bool{
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datasources.DS_GRAPHITE: true,
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datasources.DS_INFLUXDB: true,
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datasources.DS_INFLUXDB_08: true,
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datasources.DS_ES: true,
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datasources.DS_PROMETHEUS: true,
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datasources.DS_ALERTMANAGER: true,
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datasources.DS_JAEGER: true,
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datasources.DS_LOKI: true,
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datasources.DS_OPENTSDB: true,
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datasources.DS_TEMPO: true,
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datasources.DS_ZIPKIN: true,
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datasources.DS_MYSQL: true,
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datasources.DS_POSTGRES: true,
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datasources.DS_MSSQL: true,
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}
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// URLValidationError represents an error from validating a data source URL.
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type URLValidationError struct {
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Err error
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URL string
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}
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// Error returns the error message.
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func (e URLValidationError) Error() string {
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return fmt.Sprintf("validation of data source URL %q failed: %s", e.URL, e.Err.Error())
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}
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// nolint:unused
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// Unwrap returns the wrapped error.
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// Used by errors package.
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func (e URLValidationError) Unwrap() error {
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return e.Err
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}
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// reURL is a regexp to detect if a URL specifies the protocol. We match also strings where the actual protocol is
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// missing (i.e., "://"), in order to catch these as invalid when parsing.
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var reURL = regexp.MustCompile("^[^:]*://")
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// ValidateURL validates a data source's URL.
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//
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// The data source's type and URL must be provided. If successful, the valid URL object is returned, otherwise an
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// error is returned.
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func ValidateURL(typeName, urlStr string) (*url.URL, error) {
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// Check for empty URLs
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if _, exists := requiredURL[typeName]; exists && strings.TrimSpace(urlStr) == "" {
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return nil, URLValidationError{Err: errors.New("empty URL string"), URL: ""}
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}
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var u *url.URL
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var err error
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switch strings.ToLower(typeName) {
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case "mssql":
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u, err = mssql.ParseURL(urlStr)
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default:
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logger.Debug("Applying default URL parsing for this data source type", "type", typeName, "url", urlStr)
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// Make sure the URL starts with a protocol specifier, so parsing is unambiguous
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if !reURL.MatchString(urlStr) {
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logger.Debug(
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"Data source URL doesn't specify protocol, so prepending it with http:// in order to make it unambiguous",
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"type", typeName, "url", urlStr)
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urlStr = fmt.Sprintf("http://%s", urlStr)
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}
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u, err = url.Parse(urlStr)
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}
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if err != nil {
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return nil, URLValidationError{Err: err, URL: urlStr}
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}
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return u, nil
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}
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