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Diffstat (limited to 'articles/ui/ui.tex')
| -rw-r--r-- | articles/ui/ui.tex | 100 |
1 files changed, 48 insertions, 52 deletions
diff --git a/articles/ui/ui.tex b/articles/ui/ui.tex index 1743937e3..63f7ddb0f 100644 --- a/articles/ui/ui.tex +++ b/articles/ui/ui.tex @@ -697,7 +697,7 @@ customers, and may help create a competitive market. \subsection{Spending coins} % \tinyskip -\begin{figure}[t!] +\begin{figure}[p!] \subfloat[Select article][Select article. \\ Generated by Web shop.]{ \includegraphics[width=0.30\textwidth]{figs/cart.png} \label{subfig:cart}} \hfill @@ -743,7 +743,7 @@ merchant, the customer may choose to cover them. morestring=[b]" } -\begin{figure*}[t!] +\begin{figure*}[p!] \lstset{language=HTML5} \lstinputlisting{figs/taler-presence-js.html} \caption{Sample code to detect the Taler wallet. Allowing the @@ -754,10 +754,27 @@ merchant, the customer may choose to cover them. \end{figure*} -\begin{figure*}[t!] +\begin{figure*}[p!] + \lstset{language={}} +\begin{lstlisting} +HTTP/1.1 402 Payment Required +Content-Type: text/html; charset=UTF-8 +X-Taler-Contract-Url: https://shop/generate-contract/42 + +<!DOCTYPE html> +<html> + <!-- fallback for browsers without the Taler extension --> + You do not seem to have Taler installed, here are other payment options ... +</html> +\end{lstlisting} + \caption{Sample HTTP response to prompt the wallet to show an offer.} + \label{listing:http-contract} +\end{figure*} + +\begin{figure*}[p!] \lstset{language=HTML5} \lstinputlisting{figs/taler-contract.html} - \caption{Sample code to pass a contract to the Taler wallet. + \caption{Sample JavaScript code to prompt the wallet to show an offer. Here, the contract is fetched on-demand from the server. The {\tt taler\_pay()} function needs to be invoked when the user triggers the checkout.} @@ -804,27 +821,6 @@ a Taler wallet is installed (as it is in Figure~\ref{fig:shopping}). \label{listing:json-contract} \end{figure*} -\begin{figure*}[t!] - \lstset{language={}} -\begin{lstlisting} -HTTP/1.1 402 Payment Required -Content-Type: text/html; charset=UTF-8 -X-Taler-Contract-Url: https://shop/generate-contract/42 -... - -<!DOCTYPE html> -<html> - ... - <!-- fallback for browsers without the Taler extension --> - You do not seem to have Taler installed, here are - other payment options: - ... -</html> -\end{lstlisting} - \caption{Sample HTTP response for a Web resource that requires a payment.} - \label{listing:http-contract} -\end{figure*} - \subsubsection{Offer} The offer URL of the Web shop can then initiate payments by sending a @@ -859,6 +855,33 @@ the {\em fulfillment} URL provided by the merchant in the contract \subsubsection{Fulfillment} +\begin{figure*}[t!] + \lstset{language={}} +\begin{lstlisting} +HTTP/1.1 402 Payment Required +Content-Type: text/html; charset=UTF-8 +X-Taler-Contract-Hash: 2BAH2AT4GSG5JRM2W4YWTSYGY66EK4X8CX2V69D5VF7XV703AJMG +X-Taler-Offer-Url: https://shop/article/42 +X-Taler-Pay-Url: https://shop/pay +... + +<!DOCTYPE html> +<html> + ... + <!-- fallback for browsers without the Taler extension --> + You do not seem to have Taler installed, here are + other payment options: + ... +</html> +\end{lstlisting} +\caption{Sample HTTP response when the user agent navigates to a fulfillment + URL without the session state that indicates they have paid for the resource. + Note that unlike in Listing~\ref{listing:http-contract}, the response + references a contract that typically is already known to the wallet via its + hash code.} + \label{listing:http-execute} +\end{figure*} + The fulfillment URL uniquely identifies a purchase by some customer, while the offer URL identifies a generic offer that is not specific to a customer. The purchase identified by a fulfillment URL may have @@ -907,33 +930,6 @@ already approved, for example because the user obtained the link from another user, the wallet navigates to the offer URL included in the header. -\begin{figure*}[t!] - \lstset{language={}} -\begin{lstlisting} -HTTP/1.1 402 Payment Required -Content-Type: text/html; charset=UTF-8 -X-Taler-Contract-Hash: 2BAH2AT4GSG5JRM2W4YWTSYGY66EK4X8CX2V69D5VF7XV703AJMG -X-Taler-Offer-Url: https://shop/article/42 -X-Taler-Pay-Url: https://shop/pay -... - -<!DOCTYPE html> -<html> - ... - <!-- fallback for browsers without the Taler extension --> - You do not seem to have Taler installed, here are - other payment options: - ... -</html> -\end{lstlisting} -\caption{Sample HTTP response when the user agent navigates to a fulfillment - URL without the session state that indicates they have paid for the resource. - Note that unlike in Listing~\ref{listing:http-contract}, the response - references a contract that typically is already known to the wallet via its - hash code.} - \label{listing:http-execute} -\end{figure*} - \subsubsection{Discussion} Various failure modes are considered in this design: |