initialLoadImage loads a single page/frame of the image. If the image format supports thumbnails and thumbnail loading is enforced, it tries to load t

injectEtagHeader injects the ETag header into the user response

injectLastModifiedHeader injects the Last-Modified header into the user response

isImageTypeCompatible checks if the given image type is compatible with the image properties.

isImageTypePreferred checks if the given image type is in the list of preferred formats.

isMatch checks that a request matches route

isStringQuoteSafe checks if a string is safe to append without quoting.

isStringSafe checks if a string is safe to append without escaping.

len returns the number of bytes written to the buffer.

limitResponseSize limits the size of the response body to MaxSrcFileSize (if set). First, it tries to use Content-Length header to check the limit. If

loadAWSSystemManagerParams loads environment variables from AWS System Manager

loadDctHash reads a DCT hash from a reader

loadLocalFile loads environment variables from a local file if IMGPROXY_ENV_LOCAL_FILE_PATH is set

makeDownloadOptions creates a new default download options

makeImageRequestHeaders creates headers for the image request

mapSeverity converts slog.Level to OpenTelemetry log.Severity.

nestedMapSet sets a value in a nested map[string]any structure. If the key has more than one element, it creates nested maps as needed.

newBlockingReader creates a new partialReader in locked state

newBuffer creates a new buffer from the pool.

newFormatterPretty creates a new instance of formatterPretty.

newFormatterStructured creates a new formatterStructured instance.

newFromRequest creates a new ConditionalHeaders instance from the given HTTP request.

newHttpClient returns new HTTP client

newLazyObj creates a new [LazyObj] that initializes the object on the first call. It returns a function that can be called to get the object and a can

newLogHook creates a new OpenTelemetry log hook.

newRequest extracts image url and processing options from request URL and verifies them

parseBase64String parses a base64-encoded string option value

parseEnumValue returns a parser function that looks up the input value in a map. The input value is trimmed before lookup. It assumes that m contains

parseFromMap parses an option value from a map of allowed values

parseOpacityFloat parses an opacity float option value (0-1)

parsePathOptions parses processing options from the URL path

parsePathPresets parses presets from the URL path

parsePositiveNonZeroInt parses a positive non-zero integer option value

parsePreset parses a preset string and returns the name and options

parsePresets parses presets from the config and fills the presets map

parseStringSliceSep returns a parser that splits by a custom separator. The separator is obtained from the provided StringVar descriptor.

processImage calls actual image processing

readAttrValue reads an attribute value.

readByte reads a single byte from the reader. If an error occurs, it sets d.err and returns false.

readCData reads a CDATA section (until `]]>`).

readComment reads a comment (until `-->`).

readDoctype reads a directive (until `>`).

readEndTag reads an end tag.

readFrom reads XML data from the provided reader and populates the node and its children accordingly.

readProcInst reads a processing instruction (until `?>`). If the processing instruction specifies an encoding, it recreates the reader with the speci

readStartTag reads a start tag.

readText reads text until the `<` character or EOF.

RegisterAllProtocols registers all enabled protocols in the given transport

reloadImageForProcessing reloads the image for processing. For animated images, it loads all frames up to MaxAnimationFrames.

remove removes the last n bytes from the buffer.

removeNewline removes the trailing newline character from the buffer, if present.

replaceEntities replaces XML entities in the node according to the provided entity map.

replaceRemoteAddr rewrites the req.RemoteAddr property from request headers

respondWithNotModified writes not-modified response

runMetricsCollector periodically collects and sends custom metrics to New Relic

runMetricsCollector collects and sends metrics to CloudWatch

runMetricsCollector periodically collects and sends custom metrics to DataDog

sanitize sanitizes the SVG data. It strips <script> and unsafe attributes (on* events).

saveImageToFitBytes tries to save the image to fit into the specified max bytes by lowering the quality. It returns the image data that fits the requi

saveTmpImage saves the provided image data to a temporary file

setCSP sets the Content-Security-Policy header to prevent script execution.

setCacheControlNoCache sets the Cache-Control header to no-cache (default).

setCacheControlPassthrough sets the Cache-Control header from the request if passthrough is enabled in the configuration.

setContentDisposition writes the headers to the response writer

shouldImportICC returns true if we need to import ICC profile for the image.

Returns true if image should not be processed as usual